In a message dated 9/5/2012 1:12:09 P.M. Eastern Daylight Time,
stuartmacm@GMAIL.COM writes:

I've got  new mirrors from BD on my rig, and I've had to tighten down the
stud to the  point I may pull it out to keep them from flopping back at 65
mph.   Anyone put on mirrors from a later van?  It might be worth it even
if
I just left them manual.

people do it all the time.  be sure to add the 3rd  screw.