76 breaks problem

OPs Backing Plate

How many adjuster slots?
View attachment 1716231941


65 to 70 Mustang 10X1.75 rear backing plates (I believe ford 9" "small" looks like from the Ebay listing they are KH manufactured)

(Note that there is only one adjuster slot)

Also note the difference in the stamping and the bolt spacing and center hole compared to A body 7 1/4 and 8 3/4 10x1.75 backing plates
View attachment 1716231942

68 and older Chrysler A Body 10x1.75 8-3/4 backing plate
(Note that there are two adjuster slots)
View attachment 1716231944

69-72 7 1/4 10x1.75 backing plate
(Note that there are two adjuster slots)
View attachment 1716231951

Axle Flange Housing Identification
View attachment 1716231954


Here are some photos of my 67 7 1/4 10x1.75 brakes Small bolt pattern

View attachment 1716231957

View attachment 1716231958

View attachment 1716231967
I’m learning a lot from this thread and I don’t even have a dog in the fight here. Thanks for the detailed info/problem solving from everyone here.