40456 is considered our standard medium duty seat track/ The 40456 track in supplied WITHOUT the slots drilled in or mounting holes. For medium track supplied with the slots machined, use 40456-11. Many of our customers need a custom hole patter. We can work with drawings or solidworks cad files to provide a custom or standard whole patter and mounting holes to MS33601 or per your print. Material stocked in 7075-T6511, capable of aging to T73511 or T76511.
