Vehicle Fitment: 56 Buick Century; 61-64 Buick Electra; 61-63 Buick Invicta; 61-64 Buick LeSabre; 63-65 Buick Riviera; 56 Buick Roadmaster; 56 Buick Special; 56 Buick Super; 63-64 Buick Wildcat; 57 Packard Clipper; 58 Packard Hawk; 58 Packard Packard; 63-64 Studebaker Avanti; 57-58 Studebaker Champion; 57-58 Studebaker Commander; 57-58 Studebaker Golden Hawk; 60-62 Studebaker Hawk; 59-62 Studebaker Lark; 57-58 Studebaker President; 57-59 Studebaker Silver Hawk Specifications: Stroke (in): 5.36, Extended Length (in): 14.61, Upper Mount Code: S1, Lower Mount Code: BP20, Collapsed Length (in): 9.25 Interchange Part Number: 5759, TS34-34061B, 82087, 5759, 739087, SH82087, 88946177, 82087, 520-332 Product Features: Designed to offer modern control and ride comfort while preserving vintage performance. Ideal for historic and classic vehicles to improve ride comfort and handling Installation & Durability: Engineered for a precise fit on classic vehicles, easy installation, and long lasting performance. Modern gas shock technology compatible with older vehicle models