I bought a new in box dura ace 7900 crank on eBay. It was supposed to have 165mm cranks arms. When i opens the box the first thing I saw was a 180 printed on the drive side. To make matters worse the left side is a 165mm. The seller made things right but did not want to pay postage back so he told me just to keep the crank. Now I have a brand new crank with two different arm lengths. No one seems to sell just the arms. Does anyone know where I can buy a 165mm drive side 7900 crank arm or a 180 left side?
You can try eBay, but your best bet may be to part out the crankset and then apply that to the purchase of what you need. i.e. sell chain rings as one complete set (most likely to sell) then crank arm and drive arm. I am sure there is someone out there who has crashed and would like parts. Chain ring set, especially if new will have the highest demand