Are all 4 of your shoes the same? Any I have ever seen (I was brake certified for 20 years.) definitely have one shoe with longer lining then the other shoe. The shoe with the longest lining goes on the rear most side. The brakes pictured in post 1956487 is the passenger (front) side of the truck. The shoe placement would be the same on the passenger side rear.

I have received boxes of brake shoes from parts stores that contained 4 identical shoes before, I presumed someone swapped out the shoes thinking all 4 had to be the same. I've always returned them to get the correct brake shoes. Longer lining on the rear shoes, shorter lining on the front shoes, each corner, all the time. Gene