The motor plate is designed to bolt between the timing cover and engine block, making installation and removal of the engine easier. The trapezoid shape allows this one piece design to strengthen the front of the chassis. Material is ¼" thick 6061-T6 aluminum, computer-machined to accurately match the engine. Extra-large-sized trapezoidal-shape (39x30x12") will fit Ford 429 or 460 engine applications. Shipped complete with hardware and mounting tabs.