CLASSIC FIAT 500 126 THERMOSTAT HOUSING NUT & WASHER BRAND NEW Kit including the retaining nut & washer for the thermostat which goes on top of the housing. SUITABLE FOR ALL AIR-COOLED FIAT 500 & 126 ENGINES We also stock many other Fiat Lancia and Alfa Romeo parts - please do not hesitate contacting us if you're looking for something you can't find on here!