Sorry, been out of town beating the tar out of Old Blue.

I'm going to be over-clear on this one; not talking down to anyone.

The 2004 has the roof rails that run down the length of the vehicle (front to rear). There's a channel (slot) in the center of them, the channel on the left and right cross member face inward, toward each other.

Prior to 2004, the flattish cross members that want across the roof (driver to passenger side) came with. They didn't in 2004. No idea why.

To get and mount the cross members, you need the above kit. Do not order the crossmembers or that's all you will get; crossmembers with no way to mount them. Since it's only 27 cents more for the whole kit than just the cross members, I went for the whole new kit.

I originally tried a junkyard, but the ones near me would only sell the whole roof-rack, not just the cross member kit. Since I already had the roof rails, I didn't want to pay $60 and have to do all that work for a set that was banged up in an accident and might be damaged/warped anyway. Of course, I think they were totally screwing me on the price, supply and demand on Isuzu's being what it is.

The above information is incorrect, the dealer will sell you just the pieces you want. They'll even sell you just the individual locking screw, as I bought four of them since I tend to lose things. (You loosen the screw to slide the rails)