1、OE Number: The referencing OE number of this engine coolant thermostat kit are 97241129, 97241130, which is molded and designed depend on the original data, and maintaining the original car model. 2、Fitment: The front rear thermostat is a replacement for Express 3500 Van V8 6.6L, for 2500 HD V8 6.6L, for 2500 HD Classic V8 6.6L, for 3500 V8 6.6L, for 3500 Classic V8 6.6L, for 3500 HD V8 6.6L. 3、Solid Construction: Made from durable materials and built to last, this thermostat kit helps maintain the temperature of your engine to prevent overheating and contribute to efficient running. 4、Complete Kit: This kit provides everything you need for a complete thermostat replacement, including the front and rear thermostats, perfect for thermostat maintenance or to resolve engine heating issues. 5、Ideal Replacement: Direct replacement installation, meets or exceeds OEM standards for the replacement of old and damaged one on original vehicles.