I have the same question as Matt only for the Amana freezer. I can't locate the correct shelf besides the ice tray shelf, although there are grooves like Matt describes for the Roper.
Answer Hello Jen! The manufacturer is not offering any installable freezer shelves for your model a4txnwfww01. We have no information available for an installable shelf. However, searching similar models that have the full size shelves in the freezer use part number 2192514. You can try this shelf and return it if it does not fit. Here is our return policy link for you to view, thanks! http://www.appliancepartspros.com/customerservice/returns.aspx