I bought a set of RB to SB for my 19-3 snubbie. I happen to live near their office so I brought the gun to the store. The owner, Raj, couldn't have been nicer or more accommodating. That being said, the stocks did not fit well off the shelf. I left the gun with them and ran some errands for an hour while they made the stocks fit. I would rank the adjusted stocks at a 95% fit. For the money, I was satisfied and don't think they could be made to fit any better without a major rework.
If I didn't have the advantage of leaving the gun with them for the fitting I probably would have sent them back for a refund. However, I think that if you have the patience to work with someone to get a set to fit Raj will bend over backward to please you.
Also, I can't speak to how the fit is or would be for a non-conversion set.