I got a flywheel on a late B I needed to replace because it had a crack in the splines. Got one with the same part number cast into the flywheel but its different and wont go on. The splines are slightly different plus it doesn't have the deep grove for the flywheel screw. The original is in black and the replacement in gray to tell them apart. What do I have here? The parts manual doesn't list two different ones plus they're the same part number according to the casts. The replacement also doesn't have the exhaust/ignition casts.
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