Corvette filterm/regulator fitting help

[Curtb1971]

Hey guys, starting the process of building my fuel line and I'm running into an issue. I've purchased a couple different quick connect fittings for the return/supply side of the regulator and both seam to be too wide and hit each other when I'm mocking them up.
Here is the parts I have
-Napa gold 3737 fuel regulator/filter
-Fragola 491990-BL and 491989-BL
-Faster -6AN 5/16 and 3/8" threaded quick connect's

I liked the idea of the fast threaded fitting but they are in a bind to get them on. So ordered the fragolas thinking they would be thinner (strike 2) same size outer diameter if not bigger then the fast fittings.

I'm wondering if any of you have a part number for a 6AN fittings for the 3/8" and 5/16" that will work for the vette filter/reg and not interfere with each other? Driving me crazy trying to resolve the dilemma. Any input is greatly appreciated. Thanks, Curt