Aprilia SX 50 Limited Edition 14- 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 RS4 50 2014-2017 (D50B0) ZD4TK0008 / ZD4TK0000 / ZD4VX.
