Please be advised that it will fit an old model Vaquero or a New Model Blackhawk.
The grip frames interchange between New Model Blackhawks and original Vaqueros. These New Model Blackhawks have the transfer bar design. Old model Blackhawks are the three-screw variety.
Swapping out grip frames is easily done, just removing the five screws and replacing them when installing the new grip frame. You must pay attention to the trigger return spring to get it back as intended, other than that, its pretty easy.
The price is no bargain, but considering it includes grips, it's not too bad, either.