Paver size problem

I've just built a brick planter box. It's only a few courses high, and not long, so it's single skin with piers. My plan was to cap the top with some charcoal coloured concrete pavers. Went to get some on the weekend and I'm told they (Hanson) don't make them any more. The closest I can get is 100x200mm (which would leave a 10mm ledge), or 200x200mm (which would leave 45mm overhang on each side). Anyone got any ideas as to where I might get some charcoal pavers about 110mm wide?? I'm in Brisbane.