Please tell me how many you need.
Starboard gave me a full dealers "screw pouch" several years back, and some of the boards used to come with some extra screws way back when, so I have quite a few of the standard Cobra 6mm x 28 mm footstrap screws.
Send me a PM with your address and I will send you what you need.
If there is a Starboard dealer in your area, they may have some as well.
Hope this helps,