GE replaced the GWF with the MWF filter. The GWF is no longer made and is no longer available. The MWF is the replacement that GE recommends for the GWF cartridge. The MWF filters more contaminants than the GWF.
There is a GSWF filter cartridge that is longer and skinnier than the GWF/MWF filters. It is located here:
GE GSWF Refrigerator Water Filters and GE SmartWater GSWF replacement water filter cartridge
Thank you,
WaterFilters.NET