Reddit reviews American Standard 072950-1700 Hot Side Stem

Here are some links to videos on how to turn off integral stops (even though the vids use single handle faucets) https://www.youtube.com/watch?v=jnPNR6douzg
https://www.youtube.com/watch?v=iQmXAdFVyOg.

Additional links are for sources of replacement stems (OEM name was "Aquaseal", though I doubt very highly many home center employees will recognize it): https://www.griggindustries.com/page651.html
https://www.homedepot.com/p/American-Standard-072950-1700-AquaSeal-Right-Hand-Stem-130420/205603847
https://www.amazon.com/American-Standard-072950-1700-Side-Stem/dp/B0087U4F2Y

Though it illustrates a 3-handle faucet, this page shows an exploded view of your valve: https://www.azpartsmaster.com/american-standard-heritage-tub-shower-valve-schematic.aspx

And finally, a how-to rebuild an American Standard Aquaseal page from a reputable plumbing site forum: https://www.plbg.com/forum/read.php?1,281732