there is no letter designation after the HW what parts will fit?
The last character in many Frigidaire model numbers indicates a manufacturing revision. For some parts, that revision does not affect compatibility, but for others it is critical to identify the exact model.
Could you please send a photo of the model/serial tag located inside the refrigerator compartment? Also, check the back of the refrigerator for a label or tag that may show the complete model number.
Having the full model number will help ensure we identify the correct replacement parts.