Moog 5598 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 General Motors products from 1976 - 1988 Spring size: Inside Diameter 4.09", Bar Diameter .671", Installed Height 11" Load rating: 1520 lbs. One square and one tangential end All coil springs meet or exceed OEM (original equipment manufacturers) standards