Joe--The pump that I had trouble with is pictured and its a wide body? Don't know if it was a misfit globe collar or what but it just didn't fit right, so I used the small round one.
You sure might be right on the top tho as there is a difference in the two. They fit awfully tight but theres no way there should be 1/2 inch space left over???

Everything Cities Service
Specializing in old Gas Pumps
kwfrith@gondtc.com
Cell#-701-739-6133