The nice thing about National is that they will make your springs custom for your specific vehicle and needs. I was looking into having them make a set of springs for my FJ40 a while back(they didn't have a shelf spring for Cruisers then, or now for all I know), and they wanted me have my vehicle weighed on each corner, front and rear half, and right and left side, along with how I planned to use the vehicle, lift height, spring rate, etc.. They will pretty much build about anything you want, which also could mean that unless you have a pretty good idea what you DO want, you might get something you DON'T want. I have heard nothing but good about their springs, but have never heard anything at all about their installs or shop work or anything like that.