Many of the old bathcock stems, packings, etc. are still available. Take it to a plumbing parts or supply house to be matched. I can see there are miss matched stems in the faucet now.
Thanks. There is one in our area I'll try. They are very simple, it's just that the threads are worn on the left one so I have extra washers in it, which makes it stick up but run slower.
Okay they didn't have anything. It's 3.5" center to center so I don't suppose I could buy a new one that fits. But I'll look around.