Hello! I need some help identifying this stem from an old bathroom (home built in 1950). The handles appear to be American Standard Renu...and I mistakenly ordered two stems/cartridges for this. Once received, I began replacement and during removal of the existing hardware realized pretty quick I was working with something different. I can't for the life of me figure out what type it is. Picture of stem pulled directly out. I'm sure the seat is still stuck back in which I will replace also. Here is the incorrect stem/valve I purchased x2... ouch. I thought it was the American Standard Renu based on the faucet handles, etc.