One too many crashes? Not a problem! Tamiya has this spare bumper designed as a replacement part for the TRF420 kit. - TRF420 B Parts x1 - The bumper design has been altered so as not to impact upon the chassis&rsquo roll characteristics. - New body mounts are 2mm offset change their attachment position for different body mount location to fine-tune your car's center of balance. - Compatible with TRF420 chassis cars.