The 1950s Ford Thunderbird Supercharger is a vintage performance part designed by Ford specifically for the V8 Thunderbird model. This belt-driven supercharger. As a retro accessory, this supercharger is perfect for those looking to enhance the performance. Also is brand new never used. And will fit other V8 applications. Note different part # on supercharger. But exact same as a VR-57 supercharger housing and internal parts also will swap to make exactly like a VR-57 supercharger. That's why it's on discount price. Needs the other pulley side part and pulley.