Will the LTZ 400 radiator fit in a 500 frame and I am ordering after market a arms and useing  the ltz 400  spindle so all break hard where and the standard bolt parern p

I wouldent think so on the radiator. Just looking at the two and the mounting locations, it dosent look even close to me. The z radiator is more squared off, the zilla is a vertical rectangle. The z radiator looks too wide and the plumbing would be a problem too.  Im comparing an 05 kfx 400 to my zilla. All z / kfx/ dvx 400s should be the same for all years.