I believe someone on the Yahoo! site made a Hardley one fit.
But any way ya go, it'd take some fabricating to get one on there. I have never seen any made for the Vulcan 750. They've mostly all been chopped down stock ones.
AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC
"When life throws you curves,
Aim for the apex."