Originally Posted by corsair23
I also have one of those SOR versions that look like a chunk of metal pounded into the rough shape of a 54mm socket
The SAE is 2-1/8", which is a snug 54mm. This works fine but some claim they are not deep enough, never seemed true for me on my IFS truck, though.
Marlin sells a very nice socket, heavy wall and sized right (doesn't slip), which is what I mostly use. He's also out of stock and still not cheap ($25).