Brake drums won't fit HELP! (pics)

Maybe I missed something above in your posts on what exactly your using? But from experience the small bolt pattern backing plates (if thats what you are still using) have a different offset then the large bolt pattern backing plates (needed for large bolt pattern drums). So when you go to mount the large bolt pattern drums (on the small bolt pattern backing plates) they do not have proper fitment. The small bolt pattern uses a 10x1.75" brake shoe and the large bolt pattern uses the 10x2.5" brake shoe. Thats always been my experience.