Aftermarket replacement catalytic converters are labeled with important information necessary to ensure that installations comply with California law. Aftermarket CATs produced and sold before January 1, 2009 should be labeled according to U.S. EPA requirements.
In this specific case, and if in fact no numbers exist on this CAT, we're afraid your only option is to replace your 1977 Ford Pickup's catalytic converter with a ARB approved (EO number stamped) catalytic converter.
ARB Catalytic Converter Search
