This topic, fuel lines. One feed and one return. Ordered these from Z and M Jeeps http://stores.zmjeeps.com/StoreFront.bok for a 1977 CJ7 auto quadra-trac. Got something that came up short, terminating at the firewall, unlike the originals that ended further front at the fuel pump. Long story short these came from Inline Tube http://www.inlinetube.com/ and they have two sets of lines with the same part number. A phone call to them and everything was taken care of. and Z and M shipped me the correct lines. Fit was exceptional with only minor tweaking. Shown here are the differences in case you run into the same problem.
Maybe a difference in transmissions or non power and power brakes or location of charcoal canister? Who knows. If you can shed some light on this I am sure Inline Tubes would be interested. Found some really neat clamps from McMaster Carr http://www.mcmaster.com/#pipe-routing-clamps/=k9n26k part number 2993T35. These are double line clamps for 5/16" tubing with a center mounting hole for a 1/4" bolt. I backed this up with a  stainless steel spacer to keep the lines off the frame a bit further to prevent rubbing and fastened it all down with a stainless button head cap screw after drilling and tapping the frame for a 1/4 - 20. The

1/4" return line was too small to be clamped by the 5/16" hole in the clamp, so we fixed this By picking up some 1/4" I.D. x 5/16" O.D. plastic tubing from MSC Industrial Supply http://www1.mscdirect.com/cgi/nnsrhm part number 48700066. Just cut a 1" long piece, slice it and slipped it over the fuel line before installing the clamp