This Kit is constructed using High-Quality OEM spec replacements for Ford Thunderbirds. These parts are Factory Design and will only work with Stock Vehicles. This Kit Contains All Of The Pieces Below: Upper Ball Joints (2 Each) and Lower Ball Joints (2 Each). This Kit Also Contains The Cotter Pins, Rubber Grease Seals/boots, Zerk Fittings (When Applicable), And The Bolts For The Ball Joints.