10 inch Drum Brake Backing/Dust Shields

Hey 65Val. Yes, on the Small Bolt Pattern. I thought I had a ten inch set, but the backing plate mounting on these have 5 holes as opposed to the 7-1/4 has 4 mounting holes. I think the center hole is the same diameter, but I will see tomorrow. Thanks. Old Dart 66
If I'm not mistaken, the 5 hole backing plates will have a larger center hole, and the bolt holes themselves will be in a different place. I think when the 7 1/4" went LBP in '72/'73? they also went to the 5 hole configuration....I stand to be corrected here. I run out of talent post '70/'71 years....!