I have bought three of the kits to convert Blackhawks to Bisleys and I have a list of the parts you needed listed in this thread:
http://www.rugerforum.com/phpBB/viewtopic.php?t=26133
Note they are in/out of stock all the time so you might need to be patient or back order some of them. Brownells will also have them and you can get them from ruger when they have them in stock too.
Now, I did start a conversion a while ago of a 7.5-inch 45 Colt Stainless Blackhawk to a bisley. Idiot me broke his wrist moving a TV so I stopped working on it hand put the original grip back on it for now but it was close to being done and I just need to get some quality times with the metal files and various sand paper and scotch pads. The photos of my process are here:
http://www.rugerforum.com/phpBB/viewtopic.php?t=27725
Note as well that Ruger has made some changes to the way they make the XR3 grips and the gun I used had a very short Blackhawk grip drame that required removing a LOT of material. I think most Hunters do have more material so you will not have to remove as much as I did.
I have a 45 Colt Blackhawk Hunter that I swaped the grip frame from a Used 44 Bisley Hunter that I got at a good price. The fit is not perfect and some day I will take files and sand paper to it to make it perfect but it works fine as is. I don't have photos of my converted 45 but I do have photos of the 44 that now has the Hunter grip frame and you can see just how close they were.
With my 45, the grip frame is just a little wider on the sides and taller in the back then the frame. The photos make it more noticable then it is in reality but it is there...
Now, when you convert your grip frame, note that there is variations with the grips so you may need to try a few to find a set that fit. I have a set of Stags I bought thet do not fit my Stainless grip frames but I am trying to find the blued steel grip frame I have (darn organization skills suck) and I hope to use them on that. The only blued Ruger Revolvers I have are Redhawks, Bearcat, and Single Sixes so I need to decide what to use the grip frame with if I go that route but a nice 4 5/8 Blued 45 Colt comes to mind.
Good Luck!