I have a Roper RT18ECRFW00 that does have a place at the bottom for 2-12' wide crisper pans. They attach to a plastic shelf with brackets on the underside to slide the pans into. The depth at the top is 24" and 12' at the bottom The pan has to be curved. I know that this model (looked at manual) was not built this way, but I bought it this way and need two of these crisper bins as mine have broken. Any suggestions?