OEM Aprilia DAX Flange Nut M16x 1.25 - 1C002565 (ex 8221329)
Complete fitment list at bottom of this page.
Most commonly used as swingarm pivot pin nut (on 660 models).
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*SR50 Owners Please note: This part is for Piaggio engined SR50 only. Piaggio engines have the RH engine cover seen below: