Tank to Pump fuel line replace - 62 C10

[bhap]

Does anyone have any tips or suggestions for replacing the 5/16" fuel line between the cab mounted tank and the fuel pump? There are three clips that hold the line to the frame - 2 are easily accessible but the third, front clip is inside the boxed section of frame. There is an opening, but the engine mount is pretty much in the way. I have screw in clips, but I don't see how to get a wrench on the bolt so was hoping to find an original type "push in" fuel line clip. Anyone know a source? I've found a couple of threads asking a similar question, but none that offer suggestions.

Thanks in advance for your help.