Chassis Engineering AS-2019CG Features:

AS-2019CG Complete Leaf Spring Rear End Mounting Kit for 1939-1940 Mercury (Gas Shocks)   A bolt on kit, however welding is required to attach spring pads to the rear end. Mercury requires wider rear end than usual, about 60" flange to flange.
This Kit Includes: Front and rear brackets, U-bolts with nuts, complete rear shock kit, spring retainers, gas shocks, shackles, slider springs, spring pads, hardware, and instructions. Prevent your suspension from bottoming-out and expensive vehicle damage by including a pair of adjustable rubber snubbers with your order.