F-150 FX4

ok so is there a 2'' and 2.5'' level? b/c iv seen ppl say theyv done both and i want new tires at the end of the winter and want to know what size tire i can fit. the kid i got it from said it has a 2'' level, does the 2.5'' come with an aal in the back or just a bigger block to level it out. so i know for shure its a 2'', i know it wont make a big diff just want to know.