Craig, ya, that's what we did. It's a laborious process to do. Dwaine milled down some stock to make the bushings. I don't know if it can be a worthwhile business product to offer when the OEM product is about $70 per side. An aftermarket one would be at least double that, even when the core part is returned. Lot of labor involved.
Owners have to be comfortable removing the halfshaft to do this, which is another hurdle towards having this as a viable product. FWIW, I've mostly seen the passenger side one fail. I'm on my original driver's side mount but replaced two passenger side mounts.