I just got a used Koala cabinet.... not the instruction manual. I've searched all over the dang thing and can't find a model number. I need to get an insert for my Janome MC 6600... So, I need to know the model, but I'd also love feedback on the best place to buy an insert!! I've attached 2 (darkish) pictures of the 2 pieces to the table. Thanks in advance, Byrdie.