Firstly, where is it leaking from? If its from the gasket seals around the water pump body, you can use rtv sealant to re-seal the water pump.
However, if it leaks from the pulley bearing, I'm afraid you will have to change the entire pump.
Can offset +45 provide sufficient clearance for stock calipers? is it too deep?
Thinking of using this offset for Wira 1.8 with stock calipers...
Say if later change to twin pot calipers, would it also be OK?