Knucklehead Rocker Box Seal Kit for 1 Head

Knucklehead rocker box cover kit is for conversion and will fit 1938-47 late model valve spring cover set on 1936-38 models.
Kit is for use on Knucklehead exhaust rocker shaft. Five piece kit includes one seal, steel extension tube and washers for 1 head. Washer has a 1.425" and 1.495" O.D., the seal has a 1.32" and 1.486" O.D., and the steel collar measures .87" in length. Rocker box seal kit has enough parts for one rear application. *NOTE: See photo for rocker arm clearance required for installaiton for rear exhaust rocker.