56740 Cylinder Genuine Fisher 2 x 10 Heavy Duty Plow A3463

56740 Fisher Cylinder 2" x 10" 

This can replace the older A3463 There is also a 56740-1 version. 

Here are some Service parts for this cylinder  Cylinder tank 56676, Split ring 64151, Rod Assembly 64152, Spacer 56733, Glandnut 56734, Seal kit 64153.