40mm bore size
O/E: 4500 12110

40mm piston diameter
O/E:4500 41110

O/E: 9640 003 1280
ID 12mm x OD 32mm x 7mm thick

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

48mm bore size
O/E: 503 93 90 73

48mm piston diameter
O/E:503 69 13 71

48mm piston diameter
O/E:544 22 38 02

O/E: 503 54 39 01

Fits 36" & 42"
O.E: -

HK series, ORIGINAL Tillotson
O/E: 15C 21

Suits STIHL FS160, FS220, FS280 & FS290

New genreation Module