Replacement water pump

[S81]

I've removed the water pump( shaft driven) as I thought the block o ring was weeping engine oil slightly ,(only seen it when I took sump off )but when I got it removed i discovered its actually leaking from a weep hole in the bottom of the pump ,i'm assuming theres a seal inside the pump that's leaking ,does anyone know who made the pumps for Audi it's stamped what looks like UT austria ,i'm going to change pump rather than refurb it as it's fairly nasty job to remove and even nastier to refit and don't want to have to do it a 2 nd time if refurb wasn't successful