I used the fuel safe reinforced hose. I forget the size. Stiff when cold. Put in hot water to form. I think you could form it with a oven at about 175F also but I didn't try that.
Cam I hope this helps you. This fuel fill hose has a molded 90 deg bend and can be cut each side of the bend and with the 45 deg hose will make a very neat installation.
The sparco fuel fill assembly is 2.25" OD vs the tank's 2" OD inlet so you'll need some kind of transition between two. A lot of folks are using this combo:
90 degree fuel fill hose elbow Gates 24717
45 deg Gates 24713
2" to 2.25" exh adapter ROI 548543 All auto zone or walker (summit) 41700
Personally I used the 90 elbow and welded up a 45* stainless transition piece with this straight section to finish it off: