Hy 8flat, Years ago I purchased a "Detroit locker" for my 57 Chevrolet one ton and over the years I acquired a 1959 Chevrolet Spartan 100 Chevrolet dump truck with a two speed Eaton rear axle which was also equipped with a "Detroit Locker, or No Spin" rear axle. So they were out there and available at one time, maybe an Ebay search will turn something up, or post an ad in the parts wanted forum.
