Identifying Used DL3 Power Fold Mirrors

[lryfer]

I am looking for the option of power fold heated mirrors for my 2006 Silverado. So how do I identify if the used mirrors are the DL3 version?

 

Any identifying marks on the mirrors that i should look for? The arrow shaped dots I see in rigs that have the non power fold mirrors as well as power fold trucks..

 

Will I also need to get a different switch as well?

 

Need help before I get burned.