[craig]

The shifter itself is a Ford, the basic design lasted thru most of the 60's and was used on FSC's, Intermediates as well as Compacts, including Mustangs.
Where the 2 bolts are attaching it to the plate with the forward running straps, is where it originally bolted to the tail housing of the trans. There should be a 3rd bolt hole up behind the shift arms that also attached to the tail housing. The tab that is a 90 degrees to the shift arms is for the backup light switch. The plate and forward running arms appear to be a fabricated thing