The non-ford racks pictured in Marco's photos, are from the Standard Safety Corp., L.A. Calif. They made both the trunk and the supporting rack to work together as a unit. The solid racks themselves came with slightly different mounting fitting (to body), specific to each model of the Ford.
Of course they did not just make these rack/trunks for Fords, the had a whole range of marques they catered to.
One of these Standard Safety Corp. racks/trunks was on my Nov. '27 Tudor when I bought it in 1965. When I sold the car, I kept both the rack and the trunk, later mounting it to my '28 Phaeton, where it remains today.
Prior to mounting the mounting rack to my '29 Phaeton, I had it re-plated. In the process of doing that I noticed that it was stamped (in addition to 'Standard Safety Corp. - Los Angeles) "Ford Tudor Sedan". That indicated to me that their racks that held their proprietary trunks, were made for specific models.
And like Steve Plucker mentions, it came with special bumper brackets that extended the bumpers back behind the trunk. These were not the Ford option that Steve refers to, but special brackets that came with the trunk rack from Standard Safety Corp.
I have quite a few original accessory items for the Ford Model A that were made by the Standard Safety Corp. L.A., so this trunk and rack was just one of the many after-market accessories that they made - not just for Ford, but for all the high-selling marques (read, Chevy, Dodge, etc.)
- Doug Vieyra