just talked to rev baron about same thing. 03 coolers do not have the correct bend up at the back. he says all other years will work. We have used cooler off 03 blair morgan before and it worked out. the morgan bends up in back same as the 440 chassis.Will the tunnel cooler off of a 03 600/800 REV work on the 03 440 chassis? Modding this sled to a 600 and want to keep it cool. Thanks for the help. Later.