Mr. Wilson,
I have an '03, also, & installed the factory tow mirrors, myself. They were not too tough to do (I'm no mechanic, either). Everything bolted up & plugged in perfectly & works well. As I recall, they were somewhat over $300. 00 from the dealer.
To be honest with you, on my '91 W-250, I installed a 6" convex mirror on the drivers side mirror & a 7" on the passenger side. Connected them with metal extensions. They work much better than the small convex mirror on the stock tow mirrors for the 3rd Gens.
A lot of people really like how the tow mirrors work but, the set-up on my 1st gen. is FAR superior. Mostly because, the convex mirrors are so much larger. The smaller ones probably work for younger "eyes", than mine but, not for me.
Joe F. (Buffalo)