baha
+1y
the air bags as far as 2500 & 2600 that is their size, and load rating. Alot of people run 2500 in the front (because of space restraints) and 2600 in the rear. if you go to this website they have a pretty good chart if you want to look at some load to bag height characteristics. Also the bigger bag 2600 can handle more weight, also get the same amount of lift with the 2500 size with less air pressure.
kit looks pretty complete, you can get an adjustable pressure switch at home depot for $15, you should probably ask the guy what fittings and what size come with the fitting back, I spent more money on my fittings and copper line then I did my air bags lol good luck man!
Rob