Better point that laughing finger at yourself. There is a rubber hose that connects to the drivers side of the pumpkin and allows the axle to move up and down. It then tee's off to the wheel cylinders.
3/16 sounds right. As far as the length? It would be easy to measure from the tee to the wheel cylinder then add 2 inches for bends. Might want to buy prefit lines or a double flaring tool to couyt yours to length.
I redid all of my lines with such a tool, oh and a $5 tubing cutter.