I just read your article again and it is a little confusing:
Anyway we do not have any two bolt fixing distributors though we have plenty of Diver’s Helmet and Crab Top ones they are all three bolt fixing.
I thought the crab dissy is a two bolt fixing, not three.
If you do use the crab type, this may help you.
https://myflatheadford.com/wp-conten...tributor-1.pdf