Need help with radio control

Can someone please tell me how I can put a 2 pronged radio crystal like this one http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230637993646&ssPageName=STRK:MEWAX:IT#ht_3332wt_901 or this one http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=370521220911&ssPageName=STRK:MEWAX:IT#ht_2718wt_1102 into an arduino board to make a working remote control system that controls motors using the crystal and the remote on the same frequency.

I am trying to build a remote control lawnmower like the one here http://www.instructables.com/id/Arduino-RC-Lawnmower/ Where can I get just a receiver that will fit the crystal?

Thanks a lot for the help is it arduino compatible? I just plug the motors into the inputs on there right?