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I have 5 triumph crank shafts all with the same flywheel part number 70-9745. Two of these have a shorter drive sprocket shaft about 2 5/8" long and have no threads on the end. The other three have a drive sprocket shaft that is about 3 1/2" long and has a narrow thread end to it. Any help identifying the model years for these would be appreciated. I have attached some photos to help.
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