http://www.summitracing.com/parts/pt...make/chevrolet
This is not the exact set, I bought mine years ago and it didn't come with the trans mount and I believe mine was made by energy suspension.
I always have to search 2 or 3 times and use 72 c20 suburban or some different combo including 71 because most parts companies computers if you pick 72 c20 400 it uses a small block.
but if you see in the pic those mounts are specific with the raised humps and how they sit between the clam shells.