Simple enough.......OP has 2DR 2012 JK......look, I understand people want to take part in conversations, and help people, and seem knowledgable.....but people posting "well I did this with a 2011 JKU...." Is not relevant to the OP....who again has a 2012 2DR Jk.
From EXPERIENCE (you know, practical application, actually doing it) JK spring number are in 1/4" increments...on a 2DR JK. Going from 14-18 is exactly one inch of lift in the front and from 54 to 58 is exactly one inch in the rear.
I apologize, this is just a pet peeve of mine on these forums, these are a group of people here who do a great job helping guiding others (JLC08JK, Molshove, 1222, Doc, and a few others) , and then there are the people who just like to chime in whether their information is relevant or not..and while it may be good general information, is doesnt really do anything besides confuse the person needing the information.
OP, trust me, check your spring numbers, it'll be the two number combo at the end right before a two letter combo....check both front and back. A 2DR stock 2012jK you probably have 13/14 in front and 54 in the rear. You can probably get some from a local shop who does lifts, or check anything like Craigslist for take offs. Or you could spend $150 on the Daystar 1.75" coil spacers which are very simple to install, give your Jeep a nice even lift, and don't affect your ride at all (no new shocks, no exhaust mods, no evap canister mods).