yep the oil seal on the oil cooler housing is common vw fail (not just on 16v models) mine has failed and is on the list to get sorted
and looking at water pump's I have always sold qh products which seem ok quality (I have heard a few horrors about a certain ecparts place's own brand!)
I can do you a hella part with or without the housing £43 without and £53 with (not the cheapest but possibly one of the best brands?)