[6pack] Convex glass for sport rear view outside mirror

[Bruce Simms]

I have the 4" round sport miiror on both doors.   The passenger side
glass fell out and smashed as I only had the steel retaining ring on that
side.    I would like to try a convex mirror as the flat glass doesn't work on
that side.   I found a 3.75" stick-on convex mirror at Wal-mart, but can find
nothing 4".   I talked to a few glass shops that said they couldn't help.  
TRF has flat glass replacement for 14.00.
 
Ideas and suggestions?
 
Thank
you,
 
Bruce Simms
73 TR6