Doll head.
 

I cant answer on wether it will fit bet I see a smalle hole that is missing the screw that holds in that small plate on the end

doll head
 

I can't answer if it will fit but I see a small hole that is missing a screw to hold in that plate in place.

Thanks Richard.
I didn't see it until Dean Romig pointed it out to me.

George, the gun those barrels came from is an original vent rib gun. You are right, there would be issues of appearance if installed on a repro with a concave rib. I would buy your barrels if you can't use them.