Pinion-base position [mm]: 17.3. Fork opening angle [degree]: 320. Mounting hole angle [degree]: 40. OEM: 55576980, 71748653, 55576980, 55576980, 55576980, 96 831 615, 71748653, 55 55 6092, 1202218, 55556092, 62 02 084, 55556092, 55 55 6092, 55576980.