I don't know the part number but I have installed one. I have also installed a BD brake. The Jacobs brake that Dodge sells was more complicated to install and didn't seem to retard as well as the BD on similar trucks (seat of the pants). This is just my SMALL experience. I think the Jacobs is definitely a good brake though and seem to be well built. The Jacobs brake will look more factory when done then the BD because it comes from Dodge.