how high are your risers?
i took a collar off a classic touring to cover the area between the bottom of the handle bar pad, to the top of the dash. i have a 2" riser, and the collar worked perfect. depending on how high your riser is, you could get one off an sks, or an rmk. i know they have a slightly higher riser as well.
attached is the pic of the riser and collar.
here is the riser, collar, and handle bar pad installed
ive seen people use the ribbed gutter drain that you can get at home depot or lowes. imo, hey dont look as good, however get the job done. i wanted a "stock" look. thats why i ordered the collar and put it on.