The Autotecnica boss kit for VN/VP is part number 510. I've seen a few on the VN that just never seem to fit correctly. Sometimes the horn wont work, the boss slips on the steering shaft and is constantly going out of alignment, rubbing on the column covers, ect. ect.
I've found the Momo one is heaps better. Whack it on, do up the nut, get a wheel alignment (if required) and you're off
