Is his sled and X model or non X ?, one easy way to tell unless its been converted is the top of the steering post is flat with 4 bolt holes and the handlebars will be loop style or the x style post had a T Top and has flat bars, and thats the cool one to have, cause you can purchase tons of brands of riser in about any length you want, usually a stock X model riser is 7inch riser, so an extra 3inchs to 10 total really isnt that much especially if he is 6`3" nice to stand with out bending down to the bars.
I had 10inch RSI risers with my flat bars and changed to raised 3inch raised bars with a good deal on a Fly 7inch riser, back to 10inch tall again. more adjustabilility now.
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