S&S, valve spring kit. STD to .480" valve lift - 36-47 Knucklehead; Knuckles with S&S valve spring covers; S&S KN engines Engines Mounting note: Model specific hardware

Mounting note: Model specific hardware kits are available as 559463 for 91-03 Sportster

OEM style reproduction hex bolt with flange

Strap overall length 300cm

Note 2: See 537194 for the matching passenger seat

Installs with silicone over head of existing bolts

S&S, valve spring kit. STD to .480" valve lift - 36-47 Knucklehead; Knuckles with S&S valve spring covers; S&S KN engines Engines Mounting note: Model specific hardwareHigh performance valve spring kit. Includes steel top collars, lower collars, valve springs and valve keys. Fits stock Knuckleheads, S&S Knucklehead tins and all S&S KN (Knucklehead) style engines. Note: OEM valve guides may require shortening.