You can check with Bill at
www.supercoupeperformance.com, but I am pretty sure the kits he sells are the same as those that Rich was selling before closing up his business. Thus this thread might have info you're looking for.
http://www.sccoa.com/forums/showthread.php?t=57046&highlight=seat+cover
note that the cost of having a shop make the seat patterns and cut the material and such for you would likely cost more than what these kits cost. But you can check with a local shop to see what they would charge. If you're not feeling up to the work, having a shop install the kit is probably worth it, as most seats need new foam.