Doing some necroposting here, hoping to get some answers on these
W124 Secondary Water Pumps.

I have a 1989 W124 300TE and the secondary pump is seeping/leaking water but it appears to be working correctly.

Can these secondary pumps be rebuilt?

Also, when I look up the secondary pump on various sites it shows two and I am not sure which one to get, does it even matter which one I get? what are the differences between the two? One is in the 80-90 dollar price range and the other is more like 130-150 price range.