My Bobcat 763F has aux hyd lines capped off(left side of motor above battery). Don't know why. I need to put aux lines on it for grappler but don't know if they are 1/2 or 3/4. The capped hard lines are 3/4. Anybody know what size lines I need? Any reason not to run rubber lines the whole length, about 96", instead of putting a steel line in the middle section? thanks