I sent a message to the Admins.
I just needed a TIE interceptor icon so I grabbed a picture from the Web and threw it into a BTN icon. I figured other people making Star Wars maps would need it too so I uploaded it here. You'll notice I didn't ask for credit for the icon, but you're absolutely right, I should have tracked down the site and posted that for credit.
For future reference it apparently came from a 3d model made by Paulo Gabriel, a student in Brazil.