The standard package fuel rail has JIC6 threaded fuel hose fittings, this can be changed to 8mm push on or single end rail fittings.
JIC6 fitting (std package fitment)
8mm push on fitting
JIC6 fitting
Single end rail system
When do I need single end rail?
If you have no space restrictions then you should use the packages’ standard fitment of a through flow fuel rail. If however you have any parts in your engine bay that come within 20mm of the end two manifold studs you will need to use a single end rail.