Boschma plastic racks, 4u – 8u

Looking for one Boschma 4 unit plastic rack case, and 2-3 racks. that can be from 4 to 8 units. Must be black Boschma plastic racks with front and rear rack rails, as they need to stack with existing racks.
http://www.boschmacases.com/html/music4uherack.html