Thank you. I got the hold downs through summit racing. They also make them for most sizes (3/16, 1/4, 5/16, 3/8, 1/2, 5/8, & 3/4)
double line clamp, 1/2" line:
Helix Line Clamps HEXLC2500
single line clamp, 1/2" line:
Helix Line Clamps HEXLC3500
I got the 1/2" through-frame fuel fitting from AMP Cherry Performance. They are Stainless steel. Be advised, you need to call them on the phone, and have them machine/ back cut the nut to .200" , -two hundred thousandths- in order to give us more threads because our frame is thicker than average.
THRU THE FRAME RAIL FUEL FITTING