Just a minute there Partner,
Don’t give up that easily.
Contact My Buddy Eric at the “water Source plumbing specialties”
FAX 718 549 6279 Tell him “Sylvan” sent you on your cover letter.
Try to give Eric as much information as possible (Make model number, etc.)
When I have to repair old shower bodies inside marble walls in luxury apartments I have a few sources that will actually make the stem or seats or spline I need.
Many of my accounts are land mark buildings and it would take an act of congress to allow me to open a wall.
Lets see if possibly we can get you the parts you need as it may save you a lot of aggravation in the long run.
Try it you have nothing but a phone call to lose.