An idea for the one piece unit would be to injection mould it out of plastic (obviously a plastic that can handle relative high temps without deforming and such).
Another idea would be to green sand cast it out of a metal of you choice. Chrome would be a good choice for apperance, but polished aluminum may work.
Another would be to take a metal of your choice tube and bend it at the correct angle/distance (see above).
Obviously, the injection moulding and green sand casting would have to be done at a manufacturing plant. Thus, it might be more expensive, unless there is a great demand for these.
