This sounds familiar.....
Ford SO blocks have the front LH side lower bolt hole raised about 3/8" higher than a standard or CO FE Block. Genesis blocks (Aluminum at least) are an exact duplicate of the Ford SO RH bolt pattern. Apparently the Shelby blocks are the same as any non SO FE block.
I'm not sure about any others except these, although I am relying on a vendor’s statement on the Shelby block. I just went through this last year with the roadster mounts FFR provided and recently with Forte's new replacement FE poly mounts.
Good luck finding a correct mount for the RH side. It is kind of like a '69 or '70 428 CJ Mustang fan clutch replacement, part number says it’s this, but it never fits....
