These stands are what we use for our manifold conversions along with our billet fuel rail mounts. They can be shortened to fit your exact application.
They are 3/4" diameter billet aluminum, 3" long, drilled and tapped to 1/4-20 thread on both ends.
Sold each, a typical V8 manifold will require 4 stands.
Part #: MADFuelRailStand