I'm updating this thread with a partial list of fittings needed, should you choose to buy bulk nylon tubing instead of a kit. NOTE: this is what I used on my 1995 TBI C2500, and may not apply directly to newer trucks. I also modified my truck's fuel filter ends to quick-connects for easier filter changes, and am providing the part number for those as well.
All part numbers shown are for S.U.R.&R. brand fittings. I'm sure there's a way to cross-reference them to Dorman or whatever.
K095 5/16" GM Female To Nylon Line Adapter
K100 3/8" GM Female To Nylon Line Adapter
K270 5/16" GM Short Line Adapter
K275 3/8" GM Short Line Adapter
KP020 3/8" Straight Push Quick Connect
K095 and K100 are the female fittings that attach to the tank sending unit. K270 and K275 are the male ones for the TBI connections, and have a stem that will have to be bent at an angle. A couple of KP020 fittings are what I used for my filter mod.
Hope this helps.