The product is a belt tensioner assembly with a pulley designed to fit Toyota Tundra and 4Runner models. It is a replacement for OE/OEM part numbers 1662031010, 1662031011, 1662031012, and 1662031013. The tensioner assembly is manufactured by Litens and features interchange part numbers ADK0033P, 89371, 38411, 999222A, 999222, and 305123. It is a non-vintage part made in China with manufacturer part number 1662031013. This product is specifically for Toyota vehicles and may not have universal fitment, and is accompanied by a California Prop 65 warning for potential cancer and reproductive harm.