A Planted Technology seat bracket for the Mazda MX-3. Part number SB131.
The MX-3 is the small coupe Mazda built between 1991 and 1998, and the version worth having is the one with the 1.8 K8 V6, which at the time was the smallest production V6 in the world. That engine is the entire reason these still have a following.
Send us the registration
This listing does not carry a year range and Mazda changed the car partway through the run. Two minutes confirming saves ordering the wrong part, and we are adding the year data to the listing.
What you are working with
An MX-3 is small, light and low, and the cabin is tighter than the shape suggests. Shell width matters as much as the bracket does here, so tell us your height and build and we will work out which seats actually go in rather than let you buy one that does not.
Because it is light, a heavy steel framed shell gives back a real slice of what makes it quick. Ask us about the lighter GRP options if the car is being built seriously.
Practical
These are thirty years old, were cheap for most of that time, and rust. Get the carpet up and look at the metal round the mounting points before you spend anything.
Have you written anything about this exact product?
Yes, we have covered this exact product: Lexus Planted Technology Frames Updated For 2026, and Customer Car: Subaru Impreza With Corbeau RRS Seats and Planted Technology Brackets. That is first-hand coverage from our own builds and showroom, not brochure copy.
Will this fit my car?
This frame is made for the Mazda MX-3. Chassis code and years matter more than the badge, as floor pans change between generations, so if your car sits near a changeover year, send us the registration and we will confirm before you order.
Which seats does it take?
Check the bolt pattern in the specification against your seat. The Compatible seats tab above lists what bolts straight on. If your seat is not listed, tell us what you run and we will confirm the fit.
Do I keep fore-and-aft adjustment?
Only with a sliding runner between the frame and the seat, which is a separate part on Planted frames. If more than one person drives the car, budget for the runner. Our guide to sliding runners explains the options and widths.
Is this for the driver or passenger side?
Both sides are available on this listing, pick driver or passenger side at the point of order (sides listed are for right-hand-drive cars). Left-hand-drive car? Ask us, as the sides swap over and availability varies by model.
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