I've searched a few times and I cannot find a hard answer to this question. Are Series 3 bulkhead vent mechanisms the same as Series 2/2a? I'm in search of a set of levers for a 1964 2a project that I'm working on, but I don't know what right looks like. Mine has levers that someone machined very poorly out of aluminum. I'm searching for original parts, and the only ones I've found have specified for Series 3. What am I missing here? If they are different, does anyone have a source for 2a vent levers?