First the alternators are 12 volt 160 amp. One dedicated to house batts, the other is coach charging. The reason for lack of rivets What you see added to the back is cosmetic for looks only. The engine is supported by all the original support points. I have some frame rail pictures that I need to scan. Although the engine is hanging back three feet further it is 800 hundred pounds lighter. The transmisson is much closer to the rear axle. I used six inch channel for frame rails,then used what I call bridge work to tie it together. The rear axle was a real challenge ( truck axle turned over ) more on that later. Pat