That makes me think that the levers for the 109 and G250 are the same, just different numbers. The earlier stepped-foot lever (if it exists) might have a different number. I just remember a post from DA Aquamaster saying that some early 109s needed a new lever to be upgraded to balanced/adjustable with the newer poppet. Somewhere in the SB archives there might be a comparison photo of those two levers; I do seem to remember seeing one.
Here is a picture of three levers arranged from newest to oldest (I think.) The lever on the right (oldest) is the one I definitely have problems using with the Duro poppet.
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