402 big block motor mount question

[bautino95]

Hi, I'm rebuilding the 402 in my 71 c-10, and the old motor mounts are no good. It looks like the motor mount half that mounts to the engine is the same for a big and small block, (it has the threaded center hole.) but I can't find the other rubber half that goes on the other side of the mount tower. I see them as a kit form Brothers and Classic Inc, ect.. but they want like $90 for the set and they are stated as big block mounts, but I can get the small block mount for like $10 each, but without the other rubber half. Where can I find the other half of the mount or what is the official term to call it so I can do a proper search for it. thanks