a friend of mine wants to lower his 2004 silverado ext cab. hes gone from shop to shop asking and they told him they dont make kits for his truck cuz its a 2004, its too new. heres what im thinking, all thats changed from the 99-03 model to the 2004 model is the front end right? and all the frame, suspension, motor, etc is ALL THE SAME as the 99-03 style correct? so, all the belltech and djm kits should work on his truck right? am i right or what? if so, what kit should i reccommend to him? thanks.