Top 3 Ways to Install the OMP TRS-E XL and Sparco Sprint L Seats
Installing motorsport seats isn’t always a plug-and-play process—especially when you’re working with some of the widest fixed-back bucket seats on the market. Both the OMP TRS-E XL and the Sparco Sprint L are popular choices for larger drivers thanks to their generously sized steel-frame construction, supportive bolsters, and FIA approval for competitive use. With side mounting as standard and internal widths designed to fit drivers up to a 44-inch waist, these seats offer exceptional comfort and accessibility.
But here’s the catch: their extra width creates unique challenges during installation. Once you’ve attached side mounts, the seats become too wide for traditional subframe solutions, as most runners and frames are designed for standard seat widths that align with a 345mm bolt pattern. That’s why we’ve put together this blog—to walk you through the three best methods to successfully install these seats into your vehicle, based on real-world testing in our showroom.
Why Standard Installations Don’t Work
We’ve seen many customers run into issues when trying to install the OMP TRS-E XL and Sparco Sprint L using standard 345 mm-wide subframes and sliders. Once side mounts are attached, these seats become significantly wider—too wide for traditional fitting setups to work. This means most universal sliding runners and vehicle-specific frames won’t line up correctly, as they’re simply not designed to accommodate such a broad mounting footprint.
Beyond the mounting challenges, it’s also essential to consider whether these XL seats will physically fit inside your vehicle’s cabin. With their larger shoulder width and deeper bolstering, they take up more space than standard-sized bucket seats. That’s why we strongly recommend taking precise interior measurements of your vehicle, especially the seat base area and surrounding clearance, and comparing them to the seat dimensions we’ll provide later in the blog. Doing this upfront helps avoid frustration during installation and ensures your car can accommodate the seat safely and comfortably. Fitment matters, and a few careful measurements now can save you a major headache later.
Check Fitment: Detailed Seat Dimensions & Expert Advice
Because the OMP TRS-E XL and Sparco Sprint L are some of the widest FIA seats available, it’s essential to ensure they will fit comfortably inside your vehicle before making a purchase. To help you do just that, we’re providing detailed dimension diagrams for both seats—these will show exact measurements for the seat width, height, base, and bolstering.
We highly recommend comparing these dimensions with the available space in your vehicle, especially in the seat base area, transmission tunnel clearance, and door card width. Some vehicles simply won’t have the cabin space to accommodate such wide seats without modifications.
If you’re unsure whether these seats will work in your car, just ask us! Our team has extensive hands-on experience fitting both models into a wide range of vehicles, and we’re always happy to provide tailored advice or examples from past installs. Let us help you get it right the first time.
Method 1: OMP Vehicle-Specific Frames + Endurance Motorsport Side Mounts
This is our most recommended setup—and for good reason. If OMP makes a frame for your specific vehicle, you’re in luck. Their frames use a 405mm wide bolt pattern, which perfectly aligns with the side mounts once fitted to the OMP TRS-E XL or Sparco Sprint L. This is something other brands like Sparco and Corbeau typically don’t offer.
Here’s why it works so well:
- OMP subframes are vehicle-specific, meaning the mounting holes match your car’s original bolt locations.
- The Endurance Motorsport Multi-Point Side Mounts are highly adjustable, allowing you to dial in the perfect height and recline angle.
- The wider bolt pattern ensures you avoid clearance issues caused by the seat width.
With this setup, the installation process becomes quick, clean, and fully reversible, making it ideal for both road cars and track builds. Since the OMP frames are specifically designed to match the factory mounting points of your vehicle, there’s no need for drilling, cutting, or welding, which means you can get your new seat installed with minimal tools and effort. This also makes the setup completely reversible—perfect if you ever plan to return your car to stock or swap between a track and daily driving configuration. This method strikes a great balance between professional-level performance and day-to-day practicality for enthusiasts who regularly attend track days but still use their car on the road.
Method 2: Custom Fabricated Frame with Welded Bars or Drilled Plates
If your car isn’t covered by OMP’s subframe catalogue, don’t worry—you can still make it work with a little fabrication. For customers running rare vehicles or unique setups, building a custom base frame is a solid solution. This involves using a flat steel plate or welded-in cross bars across your floorpan or existing mounting points, with new bolt holes drilled to match the 405mm width needed for the side mounts.
This method is ideal if you’re comfortable with fabrication or working on a custom build, as it gives you the flexibility to create a seat setup that’s tailored specifically to your vehicle’s interior and your driving needs. Fabricating your own base frame lets you position the seat exactly where you want it, in terms of height, angle, and fore/aft location. It also opens up opportunities for unique seat layouts or setups that need to accommodate things like roll cages, pedal box modifications, or unconventional driving positions. Where off-the-shelf frames fall short—due to width, height restrictions, or bolt patterns—custom fabrication offers a bespoke solution that can maximize comfort, safety, and driving ergonomics.
Method 3: Corbeau 405mm Sliding Runners + Endurance Side Mounts
This method offers the best of both worlds: adjustability and compatibility. We tested this configuration in-store and found it to be an excellent choice for customers looking to retain sliding seat adjustment, especially if your car is shared between multiple drivers.
Here’s how it works:
- The Corbeau Motorsport Sliding Runners are wide enough to match the 405mm bolt width created by the seat and side mounts.
- When combined with Endurance Motorsport’s Multi-Point Side Mounts, you get flexible bolt options for perfect alignment.
- One side of the runner system sits slightly offset underneath the side mounts, but thanks to the runner’s width, the alignment still works perfectly.
This configuration works seamlessly with either OMP vehicle-specific subframes or a custom-fabricated base, depending on the frame availability for your vehicle, giving you the flexibility to adapt the installation to virtually any vehicle layout. The 405 mm-wide Corbeau sliding runners align perfectly with the Endurance Motorsport side mounts, solving the width issue that standard 345mm runners can’t accommodate. What makes this setup especially practical is the 200mm of travel offered by the runners, providing a wide range of forward and backward adjustment. This is a game-changer for taller drivers, vehicles with limited cabin space, or shared cars, where multiple driving positions are needed.
View the Seats & Fitting Equipment Mentioned
To make things easier, we’ve gathered all the products referenced in this guide into one place. Whether you’re looking to purchase the seats themselves or need the correct side mounts, sliding runners, or vehicle-specific subframes, we’ve got you covered with direct links to everything you need. Each item listed below has been hand-selected and tested in-store to ensure compatibility with the OMP TRS-E XL and Sparco Sprint L, so you can shop with confidence knowing these combinations work. By having all the components in one section, you can quickly build a complete installation package that suits your car and driving needs—whether it’s for a daily-driven track toy, a competition build, or anything in between. This takes the guesswork out of the equation and helps ensure your installation is safe, secure, and stress-free from the start.
-
From £39.00 Excl. VAT Select options This product has multiple variants. The options may be chosen on the product page
Final Thoughts – Choosing the Right Setup for Your Build
Whether you’re building a weekend track car, full-time race machine, or dual-purpose road setup, fitting an XL bucket seat properly is crucial—not only for comfort but also for safety and driving ergonomics.
To recap:
- Choose OMP subframes with Endurance mounts for the easiest bolt-in solution.
- Go with a fabricated frame if you’re running a unique or unsupported vehicle.
- Use Corbeau’s wide sliding runners for a flexible, adjustable setup.
And remember, our in-store team has physically tested these combinations—we’re always happy to offer help, advice, and photos of how these installs work in real vehicles.