Take the trim cover off but it’s probably the short cartridge with the blue bottom half.
They also made the short cartridge in a clear-ish off white plastic bottom half.
It’s the length or the cartridge, the date of the rough valve manufacture or the color of the cartridge is how I can identify for you. I can also look at the rough valve and probably tell you which one it is, but I’d rather just see the whole cartridge out of the faucet.
Pull the cartridge snd get a good pic of it and I’ll give you the part number.
