Where can you buy a replacement for a differential pinion shaft lock bolt gm and ford?

Need to find new / replacements for pinion shaft lock bolts in gm and ford differentials. I can't find anywhere to buy them online.Where can you buy a replacement for a differential pinion shaft lock bolt gm and ford?Most any parts store should have them...if not surely the dealer would%26gt;Where can you buy a replacement for a differential pinion shaft lock bolt gm and ford?They should be readily available in most parts stores and dealerships....it is always good idea to replace them even if they look good....