Dave's right, with slight variation. If you can get 26-27 T doors for your 28-29 closed cab pickup or AA, you'll be fine. If you have a 28-29 AA and need an express bed, a slightly modified 26-27 TT will work with some modifications but won't have the wheel indent that a true AA express bed will. If you're going for judging points, it's important. If not, who cares?
