Amen to what Mitch just said. All metal a must. Also I had to replace a coolant switch which caused a small coolant hose to burst a year ago in the winter. I just struggled to know I still needed it for 10 more days because temps remained sub zero the whole time.
I got my sensor for $29 delivered from RockAuto, of course.
I'd look locally too and price Advanced Auto with discount prices for ordering on line and picking up in store. Mitch showed us all some awesome discounts from them last month. I think you might try O'reilly's and Auto zone too and look up those discounts for online order to store.