i think this site sells in-runner stators, but there doesn't seem to be any english version, i tried calling them, but on one who answered also spoke it .
that might be for a brief overview, but when it comes to order, you need more control, for example when i'm trying to read the "buyer" rules, i want to know for sure i'm not committing to get 500 pieces , (they have a lengthy procedure for samples or something) ..