I believe it is a bolt on maser cylinder mount that bolts to the bottom of the cross member with the M/Cyl facing the rear of the car.
I think it will prove to be year specific. Ansen made bolt-on kits for '28--38 Fords, with rigs to attach MC into stock pedal or its linkage. Some moved MC to right side, worked off of crosshaft. Ads and catalogs I have just list the years, don't show detail or variants. If you ordered the complete kit, you exchanged your backing plates...Ansen didn't use Ford hydraulics, they added wheel cylinders to re-oriented stock backing plates of whatever type the car came with!