kato class 66 chassis

Hi All its been some time since I've posted on here but I'm after some help, does anybody know what american body shell might fit a Kato class 66 chassis, as I have one spare but the shell is no good. I will need to get a new board for it but the motor is working ok. As I run American locos I thought it would be a good idea to turn this into an american loco if it is possible, so any ideas will be warmly welcomed.
Many thanks in advance
Colin

 

a bit more information the Chassis dims are 125mm x 15mm and three axles to each truck at either end

 

If you can still find the Bachmann model of the GE E60CP, once used by Amtrak, it's about the same size as an EMD Class 66.
http://www.spookshow.net/loco/bache60cp.html