IIRC, its a 14x1.5 metric oring in the regulator, 90* to -6, then for the feed I used a 16x1.5 to -8 with a 5/8 dowty seal to seal against the rail. It was so tight using the 90* and the stock style regulator (had to install the fitting with the regulator off the rail, I just went custom with -6 off the rail for the return and moved the regulator downstream. I got all my parts from summit mostly or jegs.