Yeah Racing 1/8 Aluminum Fan Mount Clamp with 40mm Cooling Fans This optional fan mount is great for mounting a fan where space is limited. The fan wires can be feed through a channel to be routed under the motor for clean installation. Included with this mount is a 40x40mm fan that comes pre-wired with a JST connector. Package includes one fan mount and one fan.
Features:

Fits 540 motors
Made from 7075 aluminum
Anodized black with chamfered edges for a clean finish
Includes 40x40mm fan