Engineered specifically for use with the SO-CAL Step-Boxed™ 32 chassis—though they can be used on most early hot rod chassis, this rear spring—exclusive to SO-CAL—was engineered after the 40 Ford spring in that it is straight and not curved like a stock '32 spring. We engineered it this way because curved springs are prohibitively expensive and unnecessary for hot rod applications. We also narrowed the spring for appropriate clearance for all wheel and tire applications including full-fendered '32's. That means you can install a 55-inch rear end under a full-fendered '32 with 8-inch rims and not have the spring eye/shackle rub the tire. These springs are likewise perfect for 55-inch-and-up rear ends including 57-inch wide hiboy rear ends. (All measurements are drum face to drum face.)