Where can I find replacement stops for a shower faucet?
I'd say Screw It. That is, I haven't found any glue to be permanent &amp; have had fantastic results only with screws. Screws for plastic that are coarse threaded are the best. Find tiny screws, coarse or fine thread, &amp; pre-drill homes for them slightly tinier than the screw's threads, you'll need a precision or eyeglasses screw driver to seat them...I'd do both the crack &amp; the split. And, still crazy glue it just before your screws re-join everything for a good as or better than new stop. Then, you'll also have a solid part to even make a joint compound mold &amp; make your own new stop...it's just plastic &amp; any PVC or ABS would do. I'd even bet you could quite easily make your own out of a thick metal washer with some very careful jig-sawing &amp; drilling, it ain't gotta be pretty it just needs to last.