Gasket which fits between thermostat housing and cylinder head. Choose between designs for the "early" 3-bolt housing style, or the "later" 2-bolt housing style, as originally installed on 1967-1974 1.9L Opel engines. (Note: 1975 fuel injected Opels use part #16007 gasket). See also our part #12090 gasket sealer for this item.