4th Gear Cog -BGM PRO, 4-speed Gearbox- Vespa PK S, PK XL1, PK XL2, ETS, V50 (V5A1T, 69444-), Special (V5B3T, 94315-), Elestart (V5B4T, 1514-), PV125 (VMA2T, 150203-), ET3 (VMB1T, 8161-) - 48 Teeth (short)