Replacing transmission lines

5/16 is too small, that's the size of the fuel lines on the car. I have my own benders and as for imlinetube.com I actually called them today and was told they don't have lines for my car, only up to '72 Darts.

Also I don't have the original lines or fittings, like an idiot I scrapped them. If I had them I would have already purchased new lines and fittings.