try this - under shop, car, pinion
http://www.motormega.com/
LONG SHANK
Losi 8ight buggies and trucks require a longer shank to keep motor clear of center differential and reach the spur gear. Mega Steel Mod1 LS pinions have a .270" gear face and .650" shank length for the longer reach necessary when the motor is mounted at the opposite end of the vehicle from the spur gear with reference to the center differential. Two 4X4 mm set screws with 2mm head are used. Fit 5mm motor shaft