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Customer Inquiry: Will the Schroth Rallye 3 ASM Harness Fit My 1966 Ford Mustang Coupe?


I was looking at the Schroth Rallye 3 ASM harnesses. Are these universal, or do they come in different fits for different cars? I believe they are universal but just want to double-check.

I wonder if you have any knowledge of the suitability of these for a 1966 Ford Mustang Coupe? If not, are there some specific criteria/measurements that would tell me if these would fit?


The Schroth Rallye 3 ASM harness is indeed designed as a universal 3-point harness, making it suitable for a wide range of vehicles. However, ensuring a proper fit for your specific car, like a 1966 Ford Mustang Coupe, requires careful consideration of certain factors.

Suitability for a 1966 Ford Mustang Coupe:

Mounting Points:

The shoulder straps need to be mounted to a suitable point behind the seat, such as a harness bar, roll bar, or the factory rear seat belt mounting location.

The lap belts should mount to the factory seat belt mounting points on either side of the seat.

Seat Compatibility:

While the original seats can be used, aftermarket seats with harness slots are recommended for optimal safety and comfort.

Vehicle-Specific Adjustments:

You may need additional brackets or a harness bar to secure the harness properly in your 1966 Mustang.

Key Specifications of the Schroth Rallye 3 ASM Harness:


Shoulder Straps:
Length: Approximately 150 cm (59 inches)
Width: 2 inches (50 mm)

These straps are long enough to reach various mounting points, including harness bars, roll bars, or the factory seat belt locations, and they include adjusters for customization.

Lap Belts:
Length: Adjustable between 50 cm to 70 cm (20 inches to 28 inches)
Width: 2 inches (50 mm)

The lap belts attach to factory seat belt mounting points or other suitable anchor points, equipped with adjusters for a snug fit.

Single Rear Strap (to the rear mounting point):
Length: Approximately 200 cm (78 inches)
This strap connects the buckle to the rear mounting point, completing the 3-point configuration.


ASM Technology: Anti-Submarining (ASM) technology integrated into the shoulder belt helps prevent the risk of sliding under the lap belt in a crash, enhancing safety without needing an additional submarine strap.

Adjustability: Includes high-quality adjusters on shoulder and lap belts for a precise fit.

Mounting Hardware: Typically comes with bolt-in or clip-in options for secure installation.

Fitment Verification Steps:

Measure the Distance to Mounting Points:

Ensure the shoulder strap length of 150 cm is adequate from the mounting point to the seat.

Check Lap Belt Mounting Points:

Confirm the adjustable range fits the distance between the lap belt mounting points.

By ensuring the lengths and adjustability of the Schroth Rallye 3 ASM harness meet your Mustang’s requirements, you can determine its suitability.

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Final Thoughts

As a retailer for Schroth, we always recommend consulting with a professional tuning garage when installing safety equipment like the Rallye 3 ASM harness. Proper installation is crucial for ensuring maximum safety and performance, particularly in classic cars like the 1966 Ford Mustang Coupe. While this guide provides detailed information on the specifications and suitability of the Schroth Rallye 3 ASM harness, professional expertise can help address any unique challenges and ensure that the harness is installed correctly and securely. We hope this information helps you make an informed decision and enhances your driving safety experience. For any further questions or professional installation services, do not hesitate to contact a certified Schroth dealer or a professional tuning garage.

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