Charlie, I pulled the old beater off of the shelf, and the the few knobs that are left are shot - sorry. It's amazing how some people treat their equipment. Anyway, although you probably already know this, there are many potential donors for these knobs: 2238, 2238B, 2252, 2252B, 2265, 2265B, 2285, 2285B, 2330, 2330B, 2385, and 2600 all use the same dual-concentric tone knobs as the 2500. Sorry I couldn't help you this time around, but I wish you good luck!