This is a New Vintage Made in USA Filko Brand PN# 2028 Replacement Temperature Switch Sending Unit for 1960's and Early 70's GM applications. I am unable to pin down exact applications, I was Unable to ID the part number from my catalogs it had been updated, This is from a Former Buick Olds Dealership Parts Stock. The Vintage Filko Box is Aged and Shelf Worn but the Switch is in Nice Condition, FREE SHIPPING IN THE US.