Cometic, cylinder base gasket set FR/RR. .020" RCS - 48-62 Panhead (NU) 531539 Progressively wound design provides increased

Progressively wound design provides increased resistance to bottoming as spring compresses

Frame head tube (bull neck)

Rubber seals in the early cork style

A low profile one-piece seat with

Cometic, cylinder base gasket set FR/RR. .020" RCS - 48-62 Panhead (NU) 531539 Progressively wound design provides increasedFront & rear set. . 020" thick RCS (Rubber Coated Steel), an embossed steel core with a . 001" thick coating of nitrile rubber on both sides. OEM replacement reference 16776 48 (front). Note: Set includes 2 front gaskets which will fit without issues. Front & rear bolt pattern is identical, just the rear cylinder has a larger flange area but the unsupported area is a non issue.