1971 D6C Parts Supplier Needed

I need somewhere to order parts, I don't trust everything I find on the internet. My machine needs injectors, gaskets, o-rings, and other odd & end parts. I have searched and tried to find caterpillar parts for reasonable prices but I can only find a couple parts here and there and the dealership just wants an insane amount of money.so is there any aftermarket brands that you trust or suppliers that I can order my parts from I'm very new to this been working on the machine for a couple years now but repairing and fixing things that I didn't really need parts for

That was talk to text sorry.

Try Dana at Florin tractor ( I think they are in Sacramento Ca.) They are good to deal with.