Did A Shim Come Factory Under The Automatic Trans Mount?

[Bryan H]

I have a 71 C-10 I'm converting to an automatic with a 350 turbo. Did a factory shim come under the mount? I bought a crossmember from a guy and he gave it to me with the crossmember. It is retangular shaped and has the 2 slots for the bolts an its about 1/8" thick. It looks to me like a factory stamp piece and not made by a person. I didn't know if these trucks come factory with this or not. Any Ideas?

Thanks