this is a great guide on how to do what you're talking about (to avoid cutting the covers) - markeb01 wrote a thread on it. i'd be these, but I've already scrounged some old sets at swap meets - and yes, i accidentally cornholioed myself by buying staggered holes the first time. live n learn.
http://67-72chevytrucks.com/vboard/s...d.php?t=366853