I bought some Blaupunkt 5x7 speakers a long time ago. They didn't have mounting tabs that lined up with the original 6x8 holes. So if they're like this, you'll have to drill some holes to make them fit tight (they'll still fill up the 6x8 hole).
Not to mention they were piece of crap speakers. They had the clear blue woofer. I was pretty dumb back then...
