Aprilia RS4 50 11-13 M7 Cylinder Head Nut Set (4 Pcs). Aprilia RX 50 Factory 18-20 M7 Cylinder Head Nut Set (4 Pcs). Cylinder Head Nut Set - 4 pcs - M7 Thread. CVT Roller Sets. This product is suitable for the Aprilia SX 50 Limited Edition 2014- (D50B) ZD4PV.
