Norcold Glass Shelf 618158 (fits N6XX, N8XX, N7X, and N8X models) Fits on top of Crisper Bin 618571 on some models and on others it fits across both lower crisper bins. This glass shelf fits all of the following Norcold models, regardless of serial number: N611 N621 N641 NX611 NX641 NXA641 N811 N821... See More