What years are these hydraulic backing plates???

[Marshall V. Daut]

Or is this site too early for a hydraulic brake question?
A local special interest car business just acquired a nice Model A that has these brakes adapted to it. My expertise in antique Fords stops at midnight on December 31, 1931, so I have no idea what years these backing plates fit. I need to adjust the shoes because of too much slop between the linings and the brake drums. Give the front tires a good spin and they continue spinning for at least one minute. The brake pedal also travels too far towards the floorboard before grabbing, all of which leads me to suspect a sloppy brake shoe adjustment. Once I know what years these backing plates fit, I can investigate how to adjust the shoes - unless, of course, someone here cares to type up a thumbnail procedure for me.
Or do I need to move this question to the later V-8 Ford section? You guys have always been a help to me with my questions about a friend's 1937 Touring Sedan, so I thought I'd try here first.
Thanks in advance.
Marshall