Timinsk

Anyone post me some link(s) of where I could get manufacture parts for a 01' tahoe. I'm looking for changing the step up bar and lights, etc on the tahoe. I don't think my year matters but yeah just asking. I asked my father and he said its called "Manufactor Parts" or something like that. Because I was wandering what it was called, since I thought it was almost after market parts but its like that but made by Manufacorer. Anyone help please? Want to know where I could buy like "upgraded" parts.

regards,
Timinsk