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3. The company uses the '67-'72 Chevelle spindle with bolt-on steering arms, rotors, and calipers. If you want a 5-on-5 wheel pattern, you'll have to go to the GM 12-inch disc brakes from a '77-'88 Impala/Caprice. Looking into the back of the spindles reveals the beefy, 1-inch-thick bolt-on steering arms that replace the stock front steering arms. The ball joints are easy-to-get GM items used from about '74-'88 on most midsize and fullsize GM cars.