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Very interesting! Thanks for the information. Am I to assume that the 68B used the same system? I know the replacement pans don't have the holes drilled in the bottom ribs. Would not be a big issue doing this. The challenge is adding the wood piece to a finished seat frame. There are three "levels" in on the edges of the bottom pan which requires that three notches are cut out to match. Not easy to "twist the wood to conform. I am guessing that when the trucks were made, the board was installed and the bottom screws attached and then the top of the seat frame was lowered onto the bottom part and riveted into place. Would make installation much simpler. Most of the trucks I have looked at are missing the board which makes sense as the vast majority of restored trucks have the pan replaced.