As we all know (or will soon discover), the stock mirrors on the Street 500 & 750 are horrible, and mainly provide a view of your own shoulders.
I am pleased to report that I now have an ideal mirror setup. With my current mirrors, I can not only see the car in the lane next to me, but I can see the car directly behind me. In fact, on a three-lane highway, when riding in the center lane, I can see who's in the left lane, who's behind me, and who's in the right lane -- from EACH mirror. The field of view is so wide that I can see all three lanes in each mirror.
In my case it took two steps to get there. I first went with the Harley tapered long-stem mirrors in black (HD part # 91909-03B and 91910-03B). Those were an improvement over stock, but they still sucked. I could now successfully see the lane next to me, but nothing whatsoever behind me, and it usually took a combination of squeezing in my shoulder and leaning my head over to be able to see. They're wider than stock, and they look great on the bike, and they do extend the field of view quite a bit, they just didn't provide enough additional view.
Step 2 made all the difference: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Krator Black Mirror Relocation Extension Adapter Kit for Harley Davidson Motorcycles
This is a bizarrely-shaped set of extenders that move the mirrors outwards. It does exactly enough that the mirrors not only don't suck anymore, they're actually excellent
. This is a true safety upgrade and I recommend it to anyone.
The Krator kit has no instructions so you have to experiment a bit to figure out how to fit it, but it's not rocket science, you'll get it pretty quickly. I ran into two problems: one, the right side bolt was too long and couldn't be tightened down, it was bottoming out. It was about 1/8" too long; I added a couple of washers and that fixed it. The second problem is that the mirror extenders kept coming loose; I added some lockwashers and a dab of Loc-Tite and that solved that.
Best part is that the mirror extenders were only $15, and free shipping! That's the best $15 I've spent on this bike so far.
I don't know if the Krators with the stock mirrors would be sufficient; it's probably worth a try. But I can say that the Krators with the Long Stem Mirrors are fantastic.