Kitz, I guess I got lucky for a change. I located a complete rumble seat out of a 1930 Model A coupe which was done by LeBaron Bonney on ebay. It looks like brand new with only one slight scuff. So I am assuming that this 1930 Model A rumble seat will or should be the same size as the rumble seat in a 1930 Model A roadster. Hopefully my assumption is correct. Shipping for CA to Oregon will not be that much or make getting it cost prohibitive. So this is one less thing I need to hunt down.