It sounds like you have a Corner Creek cage. I have two of them. I bought mine on line at http://cornercreek.com but today the link seems to be down. I replaced my litter trays with plastic trays from http://www.craftycreatures.com/forferretsonly/accessories_custom_commode.html They never rust and are easy to clean. I've bought 8 trays from them so far and they have been very nice to deal with. I haven't replaced the flat drop tray yet. I've been planning to ask Crafty Creatures how much for a custome built catch tray. John Julian [Posted in FML issue 4683]