FMVSS is 16 inches from the bottom of the seat to center line of the gripping surface. States don't always have their own restrictions, but a "peace officer" with a little knowledge and attitude can give you problems, Just FYI
. If you ride into another state where your equipment might not meet that state's standards, you could be cited. Just things to be aware of.
You might go to a few shops and "floor ride a couple of bikes with apes, and see about were they sit and compare it to your bike. Last thing you want to do is spend all the money to get them up there, and then realize they are too far for comfort. I should build a fitment rack that will mount in the top clamp, that you can swivel and elevate until you like the feel, and then base your purchase on the rise, width, and pullback that is arrived at from there!
I'm keeping this for the record, so nobody steals my intellectual property!