how do I tell what I have

Thank You for the advice. I will now have the fun of unloading the rear by myself from the Durango, then to figure out what I bought. It was a fun day yesterday, gears-new be cool rad-flowtech ceramic headers-camshaft,lifters-wiper seal kit ordered from shumachers and a complete gasket kit for entire car including front and rear windshields-flowmaster mufflers