What material is this filler neck made of?
The filler neck is cad plated steel.
Does this fuel cap - filler neck, 05-01060, work with the aluminum filler neck flange you sell, 05-01056?
Yes, these two products will work together.
Are these filler necks FAA Approved?
No, they are not FAA approved.
What are the dimensions of the neck? Specifically, the height above the bead? Second question, is this neck weldable?
The unit is approx. 2.314" diameter, and from the rim to the top is approx. 0.638". The unit has threads to attach to a threaded ring which can be threaded to the tank.