This damper was on a 1974 TX650. The top triple was correct. The bottom triple is identical to a proper 1974 TX650, with the addition of splines on the bottom to accommodate the damper, and a threaded hole to accept a locating screw. My pics don't show it, but there is a hole in the splined stud on the damper that the locating screw goes into. This has got to be from a Yamaha right around 1974 that used 34mm tubes. Anyone recognize it?