52mm bore size
O/E: 544 22 28 02

Suits "new style" Stihl
O/E: 0000 350 0525

45.2mm bore size
O/E: 544 22 28 02

HD Carburettor O/E: 4203 120 0610

Suits Husky
O/E: 503 57 76 02

Air Filter Element O/E: 4137 124 2800 / 4137 124 1500

52mm piston diameter
O/E:503 60 98 03

Suits "Old Style" Stihl
O/E: 0000 350 0510

58mm piston diameter
O/E:1106 030 2003