Here is a product to make building your spare tire carrier a little easier and we have included all of the popular bolt patterns.  This plate in constructed from 1/4" steel and has the following bolt patterns 8x6.5" (one ton, three quarter ton), 8x170mm (Ford one ton), 5x4.5" (Jeep TJ, YJ, LJ, XJ, Ford), 5x5.5" (Jeep CJ, Ford) 5x5" (Jeep, JK,) 6x5.5" (Chevy, Toyota).  The holes are 1/2" and make it easy to simply weld in a hex bolt with the proper thread pitch from the backside or they can be drilled out larger in order to press in wheel studs.  This part is sold individually, unpainted and ready to weld on.