The Omega versions were all superseded by the Vectra part 95517483. The only difference is that the Vectra version has a curtain shroud around the vacuum port. Otherwise it's identical as to function and fit. Good for any Omega B or B2.
A genuine GM part has been hard to come by for some years. However
the ones here seem to be good quality, at least the last one I bought was. Looked to be a genuine part.