If this was my project, I'd return what I bought and get a full range system with standard size components. Tower will probably exchange it for you with no hassles other than you'll need to make a phone call and talk to them first. You'll have to pay the price difference, plus shipping both ways, but you'll end up with a system that you know is right for your model.

Here are the links I found for full range systems.
72 mhz ($175)
http://www3.towerhobbies.com/cgi-bin...I=LXRXF5**&P=6
or the spread spectrum version ($230)
http://www3.towerhobbies.com/cgi-bin...&I=LXSFY3&P=SM