Reproduction of the 1965-70 Chevy Fullsize Car Clutch Return Spring Kit
This set includes the return spring (Z-bar to Firewall) GM part #3859860 (R)
and an anti-rattle spring (Z-bar to Fork) GM part #3849704 (R)
The return spring is correct for 1965 models, then replaced for the 66-70 models. But there should be no issues using these parts for all 65-70 model full size cars.