i have an '04 3500 duelly..i would like to change the dinky 15" wheels to the better 16" wheels..i have measured the '07 wheels on the 3500 and they seen to be the same!! has anyone tried to fit them to an older van?? the tires are cheeper and would give a better ride!! ahats theonly thing that has bugged me about owning it..80k and rollin' and lovin it!!!