New old stock Manley brand Manufacturer Part Number: vs403 Country/Region of Manufacture: United States Interchange Part Number: 188645 Part Brand: Manley UPC: Does Not Apply NOS 12 Valve Springs fits Studebaker 1963-1964 Avanti Jet Thrust 289 Free Domestic Shipping! Left over from our old machine shop. 12 Valve Springs fits Studebaker 1963-1964 Avanti Jet Thrust V-8 R1 R2. These springs were a...