Just do what feels comfortable. I'm sure you have stock bars that are either clamped or bolted. Measure from the top of your headset to the the top of your bars I think. I know somebody more tech like Andrew or Madis will tell you better. For width, maybe just grab a ruler and hold it at different lengths to get comfortable. Remember, if it is a little wide you can just cut the bar down, not have to buy a new one if it is too short. 1200 post, nice.