Changing Crystals

I currently have the Hitec Agressor FM 3-Channel radio system. I am building another car and want to use the same radio so I need another set of cystals and a receiver. Being a newbie, I'm not sure if I need a Dual Conversion Receiver Crystal or a Single Conversion Receiver Crystal. Do I use the 3 Channel FM 75MHz Single Conversion Receiver? Any help is greatly appreciated.

The crystal needed is depends on which Rx you use.(single or dual conversion)

DCX is dual conversion, if you choose any other Rx, more than likely you will need a single conversion.