Well, looking at the box end flap on the new Bianchi 'Lightning Grips' I have here on my desk, they were made for four revolvers: S&W J-frame Chief's Special (RB), S&W K-frame M19/10 (RB), Colt 'D' Detective Cobra (Post 1967), and Colt .45 Govt Commander. On the side of the box, they do state "Mfg exclusively for Bianchi Gunleather by Pachmayr". Mine are the S&W K-frame size - purchased new last fall from CDNN Investments for a song. Sadly, the dog-ugly grips are just too ugly for a S&W... but they do protect the hammer of my new 2" M10-11. They were on for <1 minute when I put the UM's Combats back on ... later some service wood grips. I am just glad that no one saw my beautiful 10 with those things on!
To put their looks in proper perspective, if they made them the right size, I still wouldn't put them on my .454 SRH, undoubtedly my ugliest revolver.
Check CDNN - or, if you can use mine, contact me... but be forewarned... they are real ugo's!
Stainz