Not the most difficult parts to find for a cat, they do pop up from time to time. Mx dusters have a front end like the eliminators,triple tree, lowers and springs.
Both Mx duster and R4001 have the rear chain guard mount and drum brake tab. The way to be 100 percent sure what frame it is, is to measure the length of the neck tube. If it is 6" long it is a mx duster. If it is 5" long it is a r4001
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