Per American Standard, no parts available, try third parties.
Will try your recommendation- American Std also recommended Plumbing Parts Depot.
Here is the real question.....
We are considering either a partial or full bathroom renovation. If we do the partial renovation and leave the tub, tiled tub walls, and existing valve and plumbing, am I going to find myself ripping out tile to change the valve after it breaks and no parts are available (likely the day after I finish the renovation). Does it make more sense to gut and update everything rather than remodel around a 20 year old valve, cast iron tub and tiled walls (which look fine -just needs regrout). I was considering losing the tub in favor of a large stall shower anyway.
db