I use this in my 1/18th rides:
http://2dogrc.com/ecommerce/os/catal...nt-p-2177.html
Its a little longer than what you are asking for, but very close. If that is too long, then try this:
http://2dogrc.com/ecommerce/os/catal...nt-p-2175.html
Out of curiosity.... will your track allow 3s? Are you going to be running with other 18R's or trying to race in a 1/10th class with your 18R?
I like the look of the new novak motors, but the kv ranges have me worried. The kv's seem way too high for actual 1/18th sized tracks. I'm currently running a Hacker 4200kv motor in my rc18r, and its plenty for a normal sized 1/18th track. People try to run mamba 8000kv's on the track and they are all over the place. You know a noob has shown up when he busts out the 8000kv motor for a track that only has a 25 foot straight...