Does anyone else use the extruded plastic that goes on top of the drawer side?  If so, what are you doing on lateral files?  I'm trying to design a lean/cost-effective way to handle file drawers.  If I use this extrusion on the drawer front and back for a lateral file, the drawer box depth would be around 13".  Maybe I could force it to use a 14" slide.  Just curious what others are doing.