I've had 3 stainless steel Rugers (.44 SBH, .357Mag BH, .22LR Single Six) converted to Bisley grip frames.
Here is the list of parts that you need to do one Bisley grip frame conversion for a
large frame
stainless steel Ruger Blackhawk or SBH (Midway Parts Numbers except as noted):
- Ruger #: KBR00301 699239 Ruger Grip Frame Bisley Vaquero Stainless Steel
- Ruger #: KBR01801 112865 Ruger Grip Frame Screw Back Hex Head Bisley Vaquero Stainless Steel (need two) [Brownells]
- Ruger #: KBR04001B 797832 Ruger Hammer Assembly Bisley Vaquero Stainless Steel (Single Six regular stainless steel hammer is KXR04000B, and Single Six Bisley stainless steel hammer is KBR04000B)
- Ruger #: KBR03901 393315 Ruger Trigger Bisley Vaquero Stainless Steel
- Ruger #: KXR03401 795467 Ruger Trigger Pivot Pin Blackhawk, Super Blackhawk, Hunter, Vaquero, Bisley Vaquero, Single Six Stainless Steel
- Ruger #: KXR01400 844646 Ruger Grip Dowel Blackhawk, Super Blackhawk, Hunter, Bisley, Vaquero, Bisley Vaquero, Single Six, Single Six Bisley
- Ruger #: KXR06300 898800 Ruger Trigger Spring Retaining Pin Blackhawk, Super Blackhawk, Hunter, Bisley, Vaquero, Bisley Vaquero, Single Six, Single Six Bisley
- Bisley Grips, such as Ruger #: 70051 http://shopruger.com/Bisley-Black-Laminate-Grips/productinfo/70086/
Note that I've had one grip frame come with the pivot pin and grip dowel installed, another came with the grip dowel installed, so you *may* not need those parts (but they are cheap). You *could* re-purpose those parts from your old frame, but again, they're cheap.
Here's a picture of a Bisley grip frame (BEFORE fitting) test-fitted to the Single Six it will be mounted on, showing the rough nature of the as-bought grip frame and the amount of fitting needed:
I had a well-known gunsmith, John Gallagher, do all the conversions, was very happy with the results.
Hope this helps.