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The Heidts IRS is a generic setup that's offered in 55-, 56-, 58-, 60-, and 62-inch track widths for $5,300. The Challenger uses the 55-inch version, and installing it involved welding a crossmember to the frame, to which the pumpkin and coilovers attach. Like many street rods, the brakes are mounted inboard. To fit the 335/25R22 rear meats, the tubs were widened 3 inches.