Funny, I just tried installing my stainless Bisley SBHH cylinder into my new blued SBH, just to see what the two-tone would look like. They won't even go together without some force, and I'm not going to force it just to see what it looks like. Funny thing, the blued cylinder doesn't want to just "drop in" to the stainless frame either, so there's more to it than mere length.
Didn't like the look, anyway. As my wife said, it looked like a car that had a fender replaced and needed painting. :D
-- Sam