I ordered the 39-188 and 39-187 dyad cranks and I received them this week. I attempted to install them; however, they do not fit correctly. The crank arm zigzag is a different shape, which does not allow the window to close entirely. I ordered these parts based on the dimensions from the website - 5? end crank arm and 5 ? mounting bolt pattern. I did not see any dimensions for the length of the zigzag portion of the crank arm. But, based on the measurements I took, the total length of the crank arms of these parts I ordered are approximately 1? shorter than what I originally have.
Could someone please advise if you have a different crank that will match my current crank?