Help: need merc ext. box tailstock assembly.....
 

anybody have one or know somebody with one??? oh yeah it is the style for a SSM 3/4/ or 5

I don't have that, I do have a Bravo 1 lower half with a forward offset designed to go with an extension Box.

Bought it as a spare and found out it would hit my drain plug when trimmed down so very little use.

Maybe you could be more specific about which parts you need