They were originally designed for armored vehicles as I understand it. Weight savings was last on the list. My brackets should be here tomorrow. I ordered the right 4 bolt ones from Alconkits. Hope they didn't screw it up.
Alcon Brake Kits - High Performance Brake Upgrades
Alcon Brake Kits supplies performance brake kits for sports cars and heavy duty trucks for armored and off-road trucks worldwide. Find replacement brake pads, rotors, and upgrades in stock
alconkits.com