I'm modifying a couple racks to sit 3/8" farther to the rear than my production rack. This allows a Corbin smuggler to clear the rack and also permits a trunk to be mounted with the smuggler. Also, if you have a trunk mounted but would like it moved to the rear 3/8" this is the ticket. There is an additional cost and I only have one more. This requires machined plugs of the same grade aluminum, press fit in the mounting holes, TIG welded both sides, machined flush and then re-drilled & counterbored before powdercoating.