Shower diverter was sticking, took a pipe wrench to stem and managed to snap stem off. Can't see anything for socket to fit on back in wall. House was built in 1985 and I'm guessing it's a generic 3 handle model. I've changed guts on both hot and cold with no problems. Anybody got any ideas? I'm pretty much a shower guy so I was lucky the stem broke off in shower mode.

Can you post a picture of the faucet, and possibly the broken diverter inside the wall ?

Back to you

Milo

You probably need one of these,

https://images-na.ssl-images-amazon.com/images/I/71FBYg0BNoL._AC_UL115_.jpg

Shower valve socket set. A specific model, or picture would be helpful.