The change in outlet sizes was incidental. The cores fit fine and I just used a step down union to connect the two. Considering that I just wandered into the junkyard (it started leaking on me driving down 82nd street in Portland) and came up to the first AMC I found, this has been a temporary fix that has survived about 5 years. That is why I said to take out the core and compare the two. If you want to keep the car alive and don't mind the union, go for it. Or if the tubes are different you can go from there.....Russ __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com