Anyone know a good source for water pump O rings?

the makers of the car supply them as a spare part. eg Vauxhall round one about a pound ! Japanese convoluted ones up to a tenner!

Assuming that it would fit a pattern part. It should, shouldn't it?

I got one years ago from city seals and bearings in Sheffield ,1.37 IIRC compared to 14 quid from Toyota, same item stamp etc.

the pattern part fits to the same engine, so can use the same gasket/o-ring. A pattern pump will usually come with the seal, but they often get removed in the car shops.

Thanks. It turns out that Eurocarparts sell them. I'm becoming more and more convinced that Eurocarparts is a better supplier than GSF, especially when it comes to older models.