I believe that on the newer model Scramblers, the floor boards are aluminum. They were steel on the older ones. But the bumpers and the wheels are still steel, not aluminum.

 

My 00 trail blazer have no fan, different bushing of direction than the actual 2000, I dont know why???

 

I have a 2000 Scrambler 400 2X4 Manufactured 12-28-99
I also saw on Polaris web site info about the aluminium wheels and floorboards and bumpers(Not exactly sure what a bumper is on the scrambler as the frame is what sticks out of the front and rear)
After sticking a magnet on the wheels and floorboards and having the magnet pinch my finger between it and the floorboard( An absurdly large magnet) I can tell you that these parts are steel.
And after my finger heals I will be dialing my dealer to inquire about aluminium replacements to try and save some weight.

GO STARS!!