This castor is for the shelf guide rails at the bottom of your refrigerator and allows your shelf to slide smoothly in and out. If your has become damaged or snapped, this replacement part could be just what you're looking for.
The refrigerator thermostat is responsible for maintaining the internal temperature by switching the cooling device on and off. If your food is getting frozen or spoiling earlier than expected, then this replacement thermostat may be just the part you need.