Part Number: 1316266. Fits all flat six equipped MoPar cars. Includes all parts necessary to get that rusty, corroded and non functioning heat riser operational. New "flapper' valve, shaft, all new bushings, new thermostatic spring, shielded "stop", etc.
Definitely lucked out finding this kit. Comes with everything you need to get the riser working like stock again. AND YES YOU DO NEED THIS TO WORK. There are a lot of overlooked consequences for not fixing this up to and including premature engine failure from pre ignition. It's not the most fun job but it'll save you a lot of headaches if you just fix it.