Originally Posted by toosahn

So I'm trying to find the best replacements for my '78 vintage SR rear derailleur.

So far I've come up with these:
-Bullseye NOS (weird color or expensive. also noisy apparently)
-Suntour sealed (nice but rare and expensive)
-Campy NOS (around $30, prone to cracking)
-Campy repro (apparently well-made, but $40)
-Shimano (poor fit, but that's only what I've heard)

So what is the best option for pulleys under $40, that fit will and won't crack?

Will Campy 9-spd fit? Will any Shimano fit?