It's nothing more than a spacer on one side. If you get longer stem length, they tend to let you see behind you better. Regardless, you can't tell if it's a moped or a Mack truck. Just an object in your vibrating mirror.
I got a set of bikemaster sickles the other day. They came with adapters that fit perfectly. It was just a longer stud that goes through hole. Was exactly the same on both side and didnt need a spacer but i have an 03 chopper it may be different. I have a thread with pics.
Yeah, I just got 2 chrome bolts and 2 chrome spacers from hardware store, was like $10 or so. If I remember correctly, the spacer on the right control is 1/4 " or so longer because it mounts behind not on top like the left side