Seat Cover Recommendations

[Wild at Heart]

I recently bought a cruiser that has hard molded plastic racing seats with the upper holes for a 4-point harness set-up. Does anyone know of a site that makes a durable (can handle the elements) racing seat cover for this type of seat? I have searched Jeggs, Summit, ebay, etc.. I can find many seat covers but none with the 2 slots at the top for the harness.

Thanks for your assistance.