Champion Spark Plug. STD OHV Engines = Bosh M8AC Diameter at thread: 18mm x 1,5 Height without thread: 57mm H,J,K,WM20/21 Bsa. 16H, Big4 Norton. Mid war Bsa/Norton change to 14mm Spark Plug Champion L86C Please Note: M20 and 16H owners, please check the size of your spark plug, as it can be 14 mm or 18 mm.Comparable spark plugsBosch old M145 T 1Bosch new M8ANGK A-6
Triumph TR6C 1966-1968 High Level Exhaust Pipes Slash Cut /Pair chromedPush overID at Cylinder head side 1 5/8"2 Pipes down the left hand sideID at Cylinder head side 1 5/8" Spacer available f. 1 1/2" silencers BS-0781