Which diagnostic connector for my Omega B??

Hello dear people, I wanted to ask if someone can not tell me which diagnostic plug fits for my Ommi and also works. I bought a part in the bay for cheap money and unfortunately did not work at all. Maybe someone already has experience with it and can even give me a link or something. So my Ommi is nn 2.2 Dti Bj. 2001 and I would like to read out with the cable, delete and so. PS the original “OP COM” I found already n, but this is clearly not my price range. There has to be a better (cheaper) alternative, right??