Polyurethane transmission mount

I'm trying to locate a replacement transmission mount for my '93 K3500, equipped with a 4L80E, but cannot seem to find a product or part number recommended, here in the forum.

I've been to the Energy Suspension (ES) website to look up the part number...but am only getting the "sorry - won't fit" message. They have a polyurethane tranny mount for a 454, but I couldn't tell which transmission it was for. (Their part number is: 3.1129G)

Does anybody know if this part works? Any recommendations?

I sure appreciated the excellent thread about the ES polyurethane inserts, for use with GM's original 'clam shell' engine mounts, several years back.

Thanks!