I have the updated version with the narrow sealing surface rings. I am thinking about replacing them all . I have carefully lapped them twice now and now have a small flutter. My question is has anyone tried the aftermarket replacement pumps for the 108-2104 Cat pumps. I see them listed from ctp and others for around 70 bucks each, delivered. I think the Cat ones may have come down a little in price but are still around 185 bucks each. Would not shock me if they were made in same plant. I have noticed that some of Interstate-McBee Cat replacement pumps show to be made in Germany. Haven't checked on this part number though.