Race Car Mounting Hardware. Regardless of what car you drive or what class you compete in, you are going to need to install a harness system. Proper harness mounting is essential for proper function. We stock harness end plates, long and short eyebolts, slide bars adjusters, long and short snap ends, bolt ends in both 2" and 3" width - you name it, DiscoveryParts has it. We even have the harness belt roll bar end clamps to keep your shoulder belts or head containment net in the perfect position. Whether you are mounting a new system or reconfiguring an old one, we have what you need to get the job done correctly and safely.