Cat 304 Pins and Bushing Purchase

So I had another thread about pins and bushing damage. Turns out I got lucky and I can just replace the pins and bushings. I would like to do all 4 lower pins and bushings while I have it apart, but the price of these things is astronomical. Does anyone have any other outlets to get them than Cat ? There is an Ebay guy too in NY but still crazy money. I could have some made but since they are worn how would we know what size to make, unless the parts book calls out sizes, was thinking of...

Cat 304 Pins and Bushing Purchase

Cat 304 Pins and Bushing Purchase