Brian, Is the pictured mount in this picture SM420 in a '51 3100 from another thread on the topic the one your are referring to?

Now you have me 2nd guessing my memory and will have to go relook at my truck. More on that when I can get time to go check. wink

Classic Industries lists this transmission rear mount for both 3 and 4 speed applications. They also offer a mount repair kit but it currently shows as out of stock.

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)