Just an FYI as I look for a part number or turn signal mirrors for my 2002 I'm not seeing them. I do find plenty on 2003 model trucks, while still the same generation might not be the same bolt patterns, I don't know. Maybe somebody who has done this could answer the question?

You might have to buy later model mirrors that have the signals in them but will still bolt to your truck but the wiring isn't there, so you will have to run it. I find running wires, installing relays, etc. the easiest thing to do with vehicle modifications, but that's just me.