Aeroflow Fuel Rail Fits Holden 304-355 V8 Fuel Rails Suit 14mm 8ORB Ports -Black Sleeving and they're also clearly marked

and they're also clearly marked for proper flow direction

but they are a direct plug and play to the Aeroflow Performance Smart Coils (AF4020-8289)

RACEWORKS METRIC MALE M18X1

and some 700R4

Aeroflow Fuel Rail Fits Holden 304-355 V8 Fuel Rails Suit 14mm 8ORB Ports -Black Sleeving and they're also clearly markedPart Number : AF64 2008BLK Holden 304 355 V8 Billet EFI Fuel Rails Black Suit 14mm Full Length Fuel Injectors, 8ORB Ports Aeroflow's Billet EFI Fuel rails feature precision machining with heavy duty mounts for high pressure applications. Aeroflow fuel rails are threaded with a 8AN ORB port and have a 16. 1mm 41 64" size bore. Aeroflow fuel rails are double anodised.