carburetor neck

[dmjlambert]

Hi
What is this part properly called? In this picture from jimbosprint's 72 C20 I have added an arrow pointing to it. I am missing this part from my 69 CST/10 with 350 4bbl engine, and when I received the truck it had a piece of pipe and assorted washers on the air cleaner stud to make the wing nut hold the air cleaner top, and the crankcase breather inlet hose was just shoved off to the side taking in air and critters from the engine compartment.
Did this "neck" come in different heights, or were they all pretty much the same? If I want to put this back to stock, is this a part I need to hunt around for used?
Thanks
David