Never being one to "lead the charge" on a common sense safety aspect on these clown cars, I am just now getting around to installing wide angle, convex mirrors (CM) on my fender-mounted Speedster Aero mirrors. Numerous members of this austere group and even "el Guapo" himself have gone this route and I join those in highly recommending them for everyone.
There are a bunch of them out there at your "FLAPS" (Friendly Local Auto Parts Store) and some may be more to your liking than others. The size I chose was a 3" to fit perfectly into the larger end of my Aero mirrors, but I found that the size of the CM frame varies a lot between makers. All of those found at Autozone, Advance and O'Reilly's come from "Fit" or "CalCo" and have a relatively large, black frame around them, like this:
Not all that bad and it does the job, nicely. All three of those FLAPS were out of any more 3" after I bought that one, so I headed over to NAPA and got one of theirs from the "Trucker Section" (because the store is surrounded by Flynn's, Central Mass Truck Stop), a Grote P/N 12004 3" CM which looks almost frame-less with a tiny silver metal frame:
I kinda like the looks of the Grote a little better, but they both give a wide view of what's back there (usually Danny P.) and should both work well. Now it's time to clean up the shop - again.....