I think Montana Sky is talking about the CIPA slip on mirrors which are the same mirrors I use on my 2500HD. They cost in the neighborhod of $30.00 each
CIPA Mirrors
They work great and they don't vibrate like some of the velcro or rubber strap types on do.
I found the CIPA web site but they do not show these particular mirrors. Do a Google search "CIPA Mirrors" for dealers.