Since they're custom fit to bolt exactly into those rigs, they're a dealer-only item. But they're not terribly expensive. You might luck out and find one in a junkyard, as indeed they were installed in every diesel powered rig. But since GM didn't sell a huge number of diesel trucks, they're somewhat rare in the junkyards. It may be less hassle to just spend the $30 or so to get it from a dealer. /forums/images/graemlins/frown.gif