I have a '94 Sea Ray 230 DA and the Taylor Made cockpit windshield support rods are breaking at the mounting pads. My question is where do you measure for the replacement? The one I need are either 12 or 13 inches in length. Now I am guessing it's being measured from center screw hole to center screw hole. But I don't know if it's the length of the silver tube? I can't find it anywhere on where to measure it for the replacement. Any help would greatly be appreciated! Thanks.