Brake drum cracking

shotgunvic64 said
In this pic everything seems in order...

Daves69 said
Typically the rear shoe pad is longer. Green in the picture. They can be all long though. Make sure you didn't put two shorts on the other side.
View attachment 1715388966

I agree that both look the same in the photo.
Also missing are the shoe hold downs.

Below is a photo flipped from Chrysler's 1963 Master Tech Servo-Contact Brake Service book.
Notice the secondary shoe lining is much longer than the primary.
The original shoes are a little different than the ones you bought. However all the holes look correct - its probably an acceptable replacement.
Shoes are retained against the backing plate with washer, pin and spring hold downs; range arrows.