call and they usually get it to you over the phone, ask for the build sheet. watch out for 3.21 gears and connectivity group. in the old JK days if you had nav you had bluetooth. if you had a rubicon you had 4.10's. gearing options changed in 12 due to hp increase and connectivity changed in 11 with introduction of two nave, 430 and 730.
dealer can also tell you if you call service dept but a service advisor doesn't usually have time to sit and read you options, you have to do a little convincing