7 1/4 10" Backing Plates

cudamark said

Yours may be the narrow brake version. I'm trying to remember if the '73-6 A-body with the 7 1/4 rear used 5 hole backing plates or not.

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The '73 & up LBP used a shorter housing to accommodate the wider brake shoes, I'm not certain there's any difference in the backing plates, if that helps.