A piece of 1" OD X .065 wall tubing two feet long would be overkill as far as resistance to flex. I think .75" OD would be plenty strong, too! Remember you're going to be pushing in a nearly straight line from the pedal to the master and that size tubing in compression is incredibly strong. Using a remote reservoir or building an access door in the floor so you can fill the master sounds easier to me than trying to adapt a swing pedal to your car. JMO!