I found a link on Old South Firearms to the one made by Pietta, and it looks similar in design to the one for the Colt. It says that they send a longer double headed bolt to replace the hammer bolt which is what is done with the '51 Navy. It doesn't specify, but it would seem logical that the longer barreled buffalo '58s have the notch in the pistol butt for the stock clamp like the '60 Army does. That would seem to rule out using the stock on a normal '58 without the notch. Anyone know for sure? GF