Early on I used a 3/8" tube flare nut to a #6 AN male connector. Now I use what you show but the Russell brand I use the 3/8" clip on tube to #6 AN male, on the single fuel rail of the series III 3800SC.. The Russell connector actually tightens on to lock it in place.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "