ADs with Parts Accounts?

[pc12]

Does anyone know of AD’s with parts accounts? I’m looking to purchase a caseback for a 116500. I called RSC in Beverly Hills and was told that they could sell one but they’d have to take my original as parts are on an exchange basis.

I’ve read mixed rumors a while back that Rolex pulled parts accounts from independent watchmakers w/o CW21 certifications and that most ADs don’t have parts accounts now. So, I am curious to know if anyone knows an AD (California) that might still have a parts account and can order a caseback without having to exchange my original.