Okay, brake shoe replacement for floating type brakes, not self energizing brakes, is the long shoe is the primary shoe. The short shoe is the secondary shoe. Floating brakes use the clips at the shoe sides to hold the shoes in place and allow the shoes to float. Also, the bottoms of the shoes are stationary and do not move. The adjusters are on the sides near the hold down clips. On self energizing brakes, the short shoe is the primary shoe. Self energizing brakes are different because the shoes are held in place by a pin-spring-retainer and the shoes do not float. The adjustment is at the bottom of the shoes and the bottom of the shoes are not stationary. On floating type brakes the primary shoe does the most braking and the shoes do not rotate when the brakes are applied. On self energizing brakes, both shoes share the load and rotate somewhat as the brakes are applied. The service manual for the 1951 Kaiser Frazer page 214, 3rd paragraph down on the left outlines installation. After 1949 all Kaiser, Frazer, and Darrins used the floating type brake. I think the Henry J used the self energizing 9 inch brakes.