I had to get one for the look and brake mount + sprocket all in one. Also wondering abt width, but we'll see. Just a note, I got the sprocket today, drop-shipped from Rebel Gears in TN. they do custom motorcycle gears. 9 days wait so far. Oh they can anodize the hub or gear but it'd be like +$30.
And if you want a different gear for it, you're almost locked into getting a different one from ghetto bcs it has a 2.6" bolt circle and 2" ID