Moog 661 Coil Spring Set Powder-coated to protect against corrosion Designed to lower stresses for longer service life All coil springs are 100% load tested Worn or sagging coil springs can cause premature tire wear due to vehicle misalignment Use on Chevy products from 1958 - 1964 Spring size: Inside Diameter 3.68", Bar Diameter .609", Installed Height 11" Load rating: 1610 lbs. Tangential ends All coil springs meet or exceed OEM (original equipment manufacturers) standards