Ken, you have been reading my mind again! Your post comes at a very appropriate time for me. I just installed new 3/8 inch transmission cooler lines that I purchased from Jim K. and the lower radiator fitting is still trying to leak. I tightened it until I was afraid I would break the fitting in the radiator. Bob Burkitt told me he thought you knew where to find the washers and if my leak continued I was going to ask you about them. Hopefully someone will know where to get them but I will also do some searching.