OD 52mm x 1.2mm thick
O/E: 1122 034 3000

Fits Stihl MS381

Suits Husky
O/E: 501 51 25 01

52mm bore size
O/E: 1119 020 1204

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

Rebuild Kit (non original) o/e: RB 13

46mm bore size
O/E: 4203 020 1201