SBP front drums

Slantsix64 said

Yup 1973 and up changed the bolt pattern to 5 on 4.5.
72 will be 5 on 4

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Only disc brake equipped 73 and up A's were 5 on 4.5.
Drum brake A's were 5 on 4 to the end of front drums 1.1.76.