if I am not mistaken from model year 2001 the GS500 has a standard naked bike handlebar if I am not mistaken.
By the way, where are you from? As you're having an european model I guess form europe
Usually those handle bars the GS 500 91 comes standard with, aren't the problem, as with higher speed, the wind takes a lot of the weight of your wrists, but with a windscreen, they can be a problem