We still have the older shower heads and 1978 toilets. Matter of fact I have a call in to my plumber to come replace the innards in one. I’ll keep them running as long as possible.
Go to the hardware store and pick up the parts, 18 to 22 dollars.
Do it your self, takes about 15-20 minutes.
Save yourself about 85-100 dollars.
I used to be a Plumber, you are what I used to call a FISH.
Good deal. They are valuable relics of better days.