I've got a L4310 and I've already have the center link cylinder, but I having a hard time finding a cylinder for the tilt part. I measured the arm thats on there now, it is 19 " long so I figure I should have a cylinder that would retract and return about 4" plus and minus to 19", so that would be a 15" retracted length cylinder? It also has 5/8 pin holes. I'm I right or not. And if so where can I find one of these animals?