What PARTS did Hurst and Chrysler put in the Super Stock Barracuda & Dart not in other factory cars

davescuda said
Be be honest I don’t now why Chrysle did not get rid of the small bolt after they made these rotors. It would have save them some much money. As far as the rear brakes. The 8 3/4 rear had the big bolt pattern but they had the cheaper smaller 10 x 1 3/4 drums and shoes.

Maybe better way to look at it is from their perspective. Why change to the big bolt pattern?
It's still unclear if there was a switch made for any of the Trans-Am cars.
Was it due to a problem? (no record of that, although some talk of issues with the upper ball joints)
Was it to make it easier/cheaper to get the wheels they wanted to run?
Something else?

autoxcuda said
What application was 10 x 1 3/4 rear drums??

some low line /6 B-body?

Yes.
10 x 1.75 BBP drums were used on slant six equiped B-bodies like a 67 Belvidere
Drum p/n 2534 173

Set of Rear Brake Linings

Set for all four brakes, shoe & lining package

Looks like two sets Backing Plates for 10 x 1.75
2533 850 and 1 A and 6 cyl B-body
2534 726 and 7 A-body with trailer towing., (different axle??)