Talked to Merlin and the official line is that the part #'s for the VX and Trooper box are indeed different. Merlin agreed that the pictures are nearly identical, but he didn't know for sure if they would interchange without some modification. Trying to decide whether to pick up a Trooper air box for $75 tonight or drive an hour or two out of my way tomorrow to pick up a VX air box from an other junkyard. Hate to spend that $75 on the Trooper one and have it not fit - at that point I could have just paid the $150 or so for a brand new one.