An older frame like yours will be a little harder to match up to a bisley grip and probably won't match up and look like a current bisley.... a smooth transition. It may have a little extra dip/hump in the transition.

I did one stainless, I like the two tone.

Finding the parts will be the big hurdle.

What is going on to end the supply?

GRIPS FROM A PAIR OF .45 BISLEY VAQUEROS TO A PAIR OF .45 NM BLACKHAWKS THEN SOLD THE VAQQUEROS SO THE SWAP WHICH WAS EASY, COST ME NOTHING. BLUE OR STAINLESS, ALL THE SAME.

There is the easy way like JT mentioned which is just swapping the grip frame, grips, hammer, trigger and upper two allen head screws from a bisley onto your Blackhawk. A matter of 10-15 minutes and it is done. The hard way is to buy all the parts or a parts kit for around $250 but ou get a new unfitted grip frame and then the minutes and hours start adding up when you work that carbon or stainless steel grip frame to match the main frame on your Blackhawk. Personally, I leave the fitting of new frames to guys like Hamilton, Alan Harton or John Gallagher. The parts swap thing is something even I can do. It just depends on your patience level and how much your time is worth to you.

If you can take one apart, you can do the part swap. As mentioned, how well the parts fit up is another story. Ruger changed the profile of the frame where it meets the grip frame when they introduced the Bisley. Earlier models like yours won't really match up very well. That said, it usually isn't very objectionable.

The hammer profiles are different. The BH hammer will work in a Bisley frame but there will be a large gap at the rear and the hammer spur will sit significantly higher.

The triggers are a straight out swap. The Bisley has a deeper curve and sits further back in the trigger guard.

I would buy all the Bisley bits needed rather than mix-n-match. But, that's me.