My home cooked solution was to buy some quarter round moulding, had Home Depot cut a bunch of pieces to length (which they do at no charge). Stained them black to match my Expedit. Applied adhesive with a glue gun to the bottom of each piece. Pressed them into place using another piece of moulding to get the proper spacing. Then drilled three holes into each piece. Put finishing nails into the holes. My dad would have called this a rigamarole.
This solution is WAAAY easier!! If it was available I would have saved myself the time. So when my next Kallax purchase becomes necessary, I'll be going to the website to purchase. Thanks, Mike.
Paul