HD-OEM: 18203-36Part Number: 13-9523 UOM: 8 - SET Summary:Replica type valve spring set has 4 inner and 4 outer springs for Knuckleheads. Spring wire manufactured in Japan.Fitment: EL 1936-1940 FL 1941-1947 Measurements: Inner Spring Height: 1-1/2" Inner Spring O.D.: 1-1/8" Inner Spring I.D.: 7/8" Outer Spring Height: 1-7/8" Outer Spring O.D.: 1-5/8" Outer Spring I.D.: 1-1/4" Country of Origin: Imported