2 different 10x1 3/4, 8 3/4 backing plates?

Hi all.

Recently I picked up 2 backing plates and drums from a friend.

Both came off he's car, he switched to BBP and rear disc.

I have not asked him yet and I will.


Have you seen the non tabbed type before. I have 3 identical and 1 oddball.

PXL_20230321_233518993~2.jpg

I recall reading somewhere that there was a change to the hardware at some point?