my bad, i assumed u had both bovs, i guess you can tee piece the hoses to the bov and cut a plate to bolt into the empty space or get an adapter for the single bov so it plugs straight into the rubber pipe
yavuz tuned mine as well, didnt have any issues with idling before the tune however have read others have.. the blanking plug is around 30mm i think, will measure mine when i put the bovs back on tonight