Yes, I read of ppl using 4dr springs in 2 doors alot. They are taller but also stiffer... I hear the ride is very stiff. Myself I'd go with spacers 1st... but then I'm not a fan of spacers either. Everyone I've talked to about it says the Old Man Emu springs are great... much better ride quality & some lift, though it's only 1.5-2" (depending on how saggy your current springs are). Only downside is they're pricey... last I saw, the kit (4 springs 2 struts 2 shocks) was $699 on LowRangeOffroad. This is still on my to do list.
Fuzz