Next Episode of " Name these Parts !"

First up is a narrowed 8 3/4 mopar.
Total width axle flange is roughly 30 1/4"
Housing is roughly 25 1/4"
and the mounting brackets are at 18"

What would this be for ?
As in Drag car, Pro Street ,
Ladder Bar or 4 Link ?
Solid econo rail


The 8 3/4 --- I would call it Bob
2
Is some 64-67 Mustang Calipers mounted on some adapter brackets.
Summit has these brackets , well out of stock. But doesn't say what they are for .

What do I win?
Looks like disc on 10 inch drum spindles

A153 Front Disc Brake Conversion Kit, Mopar Non Power