My Frigidaire FCD-123T refrigerator (real actual model number - I can prove that) has a failed cold control. The part number is 5309948840 and is no longer available. I found the specs in some Robershaw information which are: N.I. 36 degrees F, N.O. -3 degrees F, capillary 64 inches. Can you make a recommendation for an adaptable universal replacement control?