When I mounted the Hellfire on the Valk as 17" was the proper height on both bikes, the Hellfire couldn't withstand the sudden wind pressure that Valk can produce @ over 90 mph. speeds that occur when doing a quick pass on two lane roads.
I have to use a handlebar mounted windshield on my 1800 Valkyrie, which has 1500
Valkyrie bars on it, and I used two sets of Memphis Shades (?) mounting hardware...

-Mike