We have taken our tried and true baby moon notch system on these 49-51 Mercurys, and modified them for our static ride cars. We include inner and outer boxing in plates cut from 1/4" PNO steel, with our 1/8" cold rolled steel inner frame caps. These allow you to run a large block under the axle lowering the car even lower. This does require some sheet metal modification to allow the differential to not contact the stock floor pan. Kit does not include drop kit, just includes the c notch kit.