Use AN-6 for both sides, thats what everyone does. I used AN-6 (3/8") on both sides. To make this work I used Earl's -6 AN Male to 3/8 in. Tube for one side, and the other I used Earl's -6 AN Male to 5/16 in. Tube for the other. Worked great!

DON'T USE A TUBE NUT + SLEEVE, IT WILL LEAK MOST LIKELY!!!

Read my instructions for more info...