I manage a GM and a Ford dealership parts department. The metric size is something I have never seen. The U.S / SAE sizing is still in-between the common sizing. If it is truly a sheet metal screw, a small bump up to a #8 will be a wise and simple find at your local hardware store![]()
It's a Porsche 928 part. My usual Porsche parts house doesn't have 'em.
