Reply To: Page variable … Left and Right page headers

What type of file do you need to supply to the printer?
If it is a PDF file then facing pages or not in InDesign does not really matter as you can export the PDF with bleed as required on all pages. Non facing pages normally have equal bleed all round so set this bleed in the export dialogue box.
If they need an InDesign file then it gets more complicated as Claudio has suggested.

Bleeds seems to be a hot topic at the moment, remember that most modern prepress workflow systems (from Kodak, Agfa, Fuji, Screen, Esko etc) will crop pages and manipulate bleed as required at pagination. We do 24 pages full colour self cover magazines and just export these with 3mm bleed all round (not as spreads) the workflow does the rest, trims the bleed where required. It should not be that big an issue.