The valve stem in the shower has broken, and I can't find a replacement of a correct size.
This is the closest match I bought:
But it is too long, and if I install it, I don't have any movement to open the water. The length inside the wall on this one is 50mm, and the original was about 45mm.
I tried to search Google Products, Amazon and eBay, for "stem" in the "kitchen and bath" categories, but didn't find anything close. And tried local shops of course.
Any thought on how to better approach this?