This is a brand new set of right and left muffler.

Part # Left side   71-2017, 70-4157, E4157, 70-3935, E3935
          Right side 71-2018, 70-4158, E4158, 70-3936, E3936

Fits: Triumph 350cc, 500cc twin T90, T100from 1958-73

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