Need help finding 8 1/4 shim kits

Well looks like this thread made it
Ok, can anyone here tell me where I can buy a shim kit for my 8 1/4 rear end 73 up Duster rear end. I don't want to buy a pinion kit, I just need shims

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Ratech Manufacturing has shims for most differentials-- for the 8-1/4 their part # 1100 ,,, can be ordered direct or from Summit Racing---- another option if you know any one that has set up an 8.8 rear axle used in Mustang , trucks etc. --- the 8.8 uses the same pinion shim