I recall people saying that they had found the correct bearing in the USA and replaced that to give the pump a new lease of life.

In my case, I found a brand new pump for sale in Greece and bought it for around 230€. When it arrived, it turned out to be almost exactly right aside from a deeper pulley with more grooves - from a V12, I think. Anyway, once installed, with the belt using all but one or two of the grooves, all is now well. Although the clearance is pretty small with the deeper pulley!

RayH