I don't know if they make a 2" or 2 1/2" for the back, but I gotta say that I'm very happy with my Rancho 44044 2 1/2" springs I got for the front. Ride seems nice so far. Not too hard. I think it looks good with my stock size (29") tires, and I think* it may fit 31's.
I bought mine used from another member. New, I think I saw they are around $100-175 apiece depending on where you get them.
Here's a pic after install on my Wagon with new stock size tires:
1990 Grand Wagoneer-"The Crapwagon"
AMC 360, TF727, NP229, 3.31gears, 2" lift
Rancho 44044, Rusty's 2" AAL, TFI
...not too rusty anymore
Plenty of patina
1926 Dodge Brothers Business Sedan 212 I4-CRANK START
1987 Lincoln Town Car Signature Series-5.0 AOD (WD)
1987 Dodge Dakota LE 3.9, A999, 3.90 gear (DD)
1994 GMC 'Burban 5.7, 4L60E, NP241, 3.42 gear (DD)
2001 Jeep Cherokee 4.0, AW4, NP231, 3.73 (limbo)