These grommets and bushings are available from ClassicParts.com as part numbers 91-062 and 91-065 (I think you need 2 of each). I just ordered a few for mine.
The bushings down at the transmission are also available from CarId.com, Chevrolet part number 3975132, which supersedes 3748357. I ordered 12 of them, and I believe you need four. I figured for their cost of shipping, I'd make the extra 2 sets available for about $12 (which would include postage). I'll do that after I know they work
