$125 is good for shipping a fender. Check Greyhound for cheaper rates. I've dealt with them in the past and they've always been great.

Dunno about the pricing for radiators. That's one of the few parts on my truck I haven't had to work on. *knocks on wood*

I buy new when it comes to wear parts like pumps, bearings, etc. Buying used parts like 'untested' radiators don't always turn out to be worth the savings.

DrewP is right about keeping an eye on the Freebies forum. Also ask in the A-D Truckers social group on the HAMB. Lota guys doing V8 swaps over there and they might just give you what you need.