Located the port-side Peter Anson Engineering cockpit fresh air vent to clear the spoiler control handle. Made a template by laminating Peter's dimensional drawing to a piece of foam board and cutting out the NACA outline.
Best location follows the advise on the Sonex builders board recommending as 'high and far forward as possible'.
Anson Engineering vents: http://www.ansoneng.com/sample-page/products-summary/fresh_air_intake/