They'll fit as good as any other barrel may fit, might need some fitting as any barrel may, each barrel is a little diffferent as it was factory fitted to it's frame. All SB1/SS1(shotgun/rimfire) and SB2(centerfire) frames, except the 10ga and 12ga Slug gun, have the same general dimensions, the materal they're made of is the difference, see the FAQ and Help on frames.
Tim