Question about carbs for tunnel rams

Hello again, needing advice on fuel line, i am having a real problem finding the correct one! Carbs are supplied with a hose tail fitting, i can change that to a screw on fitting i guess, but cant find anything to suit! The measurement from centre to centre is 8.75" and all i can find online is 6-7/16". There's an adjustable one but Edelbrock says its to suit Holley. Any advice appreciated, thanks.
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