2003 parts on my 2004 F150 Heritage

What is your question?

I bought a used 2004 f150 Heritage this year, and some of the parts on it are from a 2003 model! The vin tells me it's a 2004 model. Did Ford make a Heritage model in 2003? Could it have been put together at the end of 2003 but had a 2004 label put on it? It has a 4.2L V6. Did Ford put a 4.2L V6 in a 2004? The front bumper is from a 2004 but the assembly where the struts and shocks fit has a 2003 model configuration. The hub has 5 studs and the hub ring is 3-3/8 wide. Doesn't the 2004 hub have 6 studs?