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Universal Aluminum Fuel HardLine Fitting AN6-3/8 5/16 Female Flare Adapter Connector Tubing with Brass Insert Car Accessories - AliExpress

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Aluminum AN-6 6AN AN6 Straight Male To 5/16 3/8 Tubing Compression Oil Line Hose End Fitting Adapter Fuel Line Adaptor - AliExpress

1 Piece Straight 6AN Male Flare to 5/16 (OD 8mm) Tube Hose Fitting Adapter Fuel Hard Line Pipe Aluminum Black Anodized - AliExpress