George,
I built one a few years ago, but eventually sold it. I let the drawings and instruction manual go with the airplane, so I don't have any reference material.
Why not call BVM tomorrow morning, and ask David or Tom to snoop it out for you? They have all of the reference material available, and you could place your order at that time.
I think that they are the 1 5/16" stroke cylinders, but please have David or Tom verify it.

Call BVM at 407-327-6333

Maybe Dave Ribbbe could chime in and fill you in. He lurks around here from time to time. After all, the BVM MiG is a Ribbe design.

Harley Condra
BVM REP
JetCat REP