what you have there is a Cofle brand joystick they are found on several tractors. i am working on one right now where the cables are dragging real hard internally. which is a big problem with these joysticks. we have 3 tractors with it on there and have had to replace all of them some two times, they are not very reliable. i havent found anywhere where you can just buy parts for it, and its dealer only in most cases.