Will this part fit on a 1991 kenmore model# 2539115010. Part # AZAP6116 , should I change the PTC starter and overload, or if it is just the overload that is bad (It rattles when I shake it) just change that part? The original overload does have 4TM on it. so I am thinking it should work? This small chest freezer is old but has only been used around 10 years so it should be worth fixing? Thanks James

Hello, 
It is best to to replaced both components at same time:  

https://www.azapplianceparts.com/products/4tm13-universal-refrigerator-overload-for-whirlpool-kenmore-estate-roper-models
https://www.azapplianceparts.com/products/ic102-universal-compressor-relay-for-1-3-to-1-4-horse-power