Also works with Associated B5 based cars. An ultralight direct spur gear mount for the DR10 is here! Machined alum unit that weighs only 3.4gr with the screws. Uses a wider range of available spur gear sizes by Exotek, Kimbrough, etc. Allows for easy switching between a locked spur or the stock slipper as track conditions warrant. Uses the stock top shaft. Some compatible spur gears: Kimbrough KIM164 77T KIM145 78T KIM146 81T AND MORE. .. . . Exotek 1545 75 tooth 1546 78 tooth 1987 81 tooth 1988 84 tooth