we have a maytag dishwasher and we cannot find our book. I found a couple of pieces that we think go to the dishwasher but we don't know what they are for. There are two of them and it looks as if the snap on to something. They remind me of a shelf - they are about 2 inches wide and about 10 inches long. they are grey and the have lots of slots/slits in them. Any idea what they are for?