I had a request to go over in more detail, the enlarged mirrors I constructed for my car to give better rear vision
The materials used and are needed are; 2 pieces of flat aluminum sheet between .050 and .062" thick X 3.5" x 5.5", a right side convex mirror from the local parts store and a left side flat mirror. I'm cheap so I looked for mirrors on clearance. You might need 2 of each depending on how good your glass cutter is!! You will need the convex one big enough so it can be cut and still retain the script, see picture.
After building mine, I realized I could have made them a bit bigger by at least a 1/4", but the best way is to use your housing and figure it out for yourself. The dimension I'm providing are what I made mine.
For the right side mirror, I decided to sacrifice (break it off) the original mirror, (I have a spare anyway) so I could glue the aluminum plate directly to the base. For this, I used good 'ol black "Automotive Goop" a wonderful product for this sort of work. Make sure you have good contact and place a weight to hold it in position. Don't use RTV it won't last long and you'll be buying more materials. Leave it to cure for 24 hrs. I got the glass professionally cut at the local glass and mirror store to match the template which was a second aluminum piece, actually third as I need one for the left side as well. The right side glass was also GOOP'd on to the roughened base plate and set aside for 24 hrs. Placement is critical for both pieces so there is room to get a screw driver in to tighten the holding screw. take your time!
The left side on mine is an adjustable mirror. This presented a different challenge and as I didn't have a replacement, I could not sacrifice the old glass. My answer was to use thin two sided mirror tape to affix the aluminum plate to the old mirror then to affix the new larger mirror to the plate. Makes for a bit bulkier mirror, but it worked out fine.
The right side mirror actually allows you to see the entire right lane on the freeway if you're in the middle lane, wonderful!!
If I missed anything or there is a need for more explanation, let me know.
Just a note on the back side picture. You will see a blob of GOOP on the ball socket. On this base. it was worn and lose and needed a bit of 'help'.
Geoff.