These 1965-1966 Chevy V8 Small & Big Block Engine Frame Side Motor Mounts are an original GM part (#3977234 #3954637 #3955185 #3955186) that has been restored. In order to ensure a proper fit please reference the dimensions below as engine sizes and motor mounts can affect the overall fitment. Originally the 1965-1966 frame mounts would have fit all the engine but with modern engine swaps and newer engines being used there may be some issues. The best thing to do is to measure what you need and purchase it accordingly. See the other listings of frame mounts if these don't work.