I have a 2006 GT200 with a top box that I purchased last Summer. This thing is so fun to ride and I get 70 mpg every tank. From what I've read with a top box I should have bigger bar end weights to prevent wobble? I have had no issues with that, but hated the stock Mickey Mouse mirrors. So I made my own 3" bar ends weights. I looked online for some, but didn't like the design of any of them. I have bigger hands and with gloves on I wanted the mirrors at the "END" of the weight, not at the end of the hand grip. With gloves on my hand would be wedged in between the mirror and the headset. I turned them on my metal lathe and painted them black. I took it for a test ride to adjust the mirrors and they are way better than the stock mirrors.
And then I took an 8MM bolt and stuck it in the stock mirror hole for my RAM phone mount, works great.