I was wondering this too, because the keyfob shown in the manual doesn't look like my keys. (page 12 in the manual).. I just have the rounded ones with the jeep logo on em. I guess the best way to do it, is to get the spare made, since they're cheap & try and start the car, if it doesn't work, then it's a sentry key. lol [and at least now you have something to unlock the car with, if you need it] Granted, we have a key-chain alarm thing, not the in-key one they show there
I was here in 2007 and I'm back in 2013..