Get running on 72.55 MHz with the FM 72.55 MHz Short Crystal Set from Futaba. Included are two frequency-matched crystals, one for your radio transmitter and one for your RC vehicle's receiver. The receiver crystal has a small and short form factor and fits smaller receivers.
Simple to install, this crystal set allows you to change the frequency your vehicle runs on so you can keep clear of frequencies used by other racers. The crystals work with frequency-modulated signals.