Problem solved, and thanks for all the help! I called Booster Dewey. My booster is a Midland Ross, which uses a spacer between the booster and the master cylinder, made of two pieces: aluminum and plastic. A lot of you guys must have these. There was originally a foam rubber gasket between the two spacer pieces, which always dissolves, anyway. It is there as a filter only, and Booster said no one makes this gasket as it is unnecessary. I love it when I find out I don't need a hard to find part! ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.