Actually, I got 3" initially with the JC1B's. That settled to 2" after a month and after I added about 50 lbs of tools and other junk on the back end (about 2.5" without all the junk I added - thus the occassional claim of 2.5" lift by retailers). The JC1A's should give you 3" AFTER settling in unless you have a heavy tail...but every truck is different I suppose.
OME doesn't label anything they sell as giving a certain amount of lift. In fact, they don't sell anything I'm aware of as a "lift kit" or "lift springs" or anything like that. They have medium and heavy-duty "upgrade" springs intended to give a better ride than stock equipment and designed to ridden rougher than stock equipment. A suspension "upgrade" rather than a "lift". Of course, I'm not Tony Brown - so all this is coming at best second-hand. But this is how it was explained to me by multiple retailers, who add the "2 inch lift" labels by what people typically see. Anyway, I know that none of that is really important - but to answer the original question: No, OME does not sell a 3" lift kit, but neither do they make a 2" lift kit.