The right springs depends a lot on the vehicle specs, since a 4 door model with an auto tranny, A/C, 4WD, etc. is going to need a higher rate just to support the extra vehicle weight, compared to a 2 door 2WD with manual tranny and no options.
It also depends on what you want to do with it. Softer springs would be better for off-roading, firmer springs would be better for on road.
Find out from Napa if the same part number is for a Sport 2WD, XLT 2/4WD, and Limited 2/4WD. If they're all the same number, it might be the only set of springs available. If you want higher rate springs, they should be available for a fully loaded XLT/Limited 4WD with A/C.