Except in this instance, Ruger would be more flexible. I had a fellow Ruger Forum Member kindly offer to sell me a Montado (New Vaquero) grip frame but it was without the safety block. No problem say I, following the same logic correctly relyed upon by Flatgate.
I called Ruger and was informed that they would neither sell the safety block or the grip frame with the safety block because it was a ... "safety issue."
Now, that being said, I have found there is a difference in "flexibility" between who is answering the phone in the parts department. Some seem to connect the dots where others can't find the pencil.
I wish you well in your efforts.