Are these the pumps that break, when one is a little heavy handed removing the bolts! 
Thom
Pumps or housing?
Think housing was the original cause for waterpump failure. Heard of it before but never seen it!
Cant remember tbh, whether it was the pump of the housing, just know that the dealers kept on supplying the wrong part, it was either 1 hole to many, or one hole short! same problem with GSF, but iirc Euro car parts could get the correct part, but we had to wait 48 hours for it! this was some months ago, so maybe they are now readily available
Thom