It is the Harley 3 bolt that fits all the adapters (Pretty sure) at least thats whats on my bike, word of advise i have the Acutronix, Buy the L&M it looks cleaner and costs less than buying both pcs. from Acutronix..Thinking about purchasing a Harley styled Spike Air Cleaner. Seen a lot of options on EBay that aren't too expensive. What questions should I ask the vendor to ensure that he has the right air cleaner that will fit my Fury with the Accutronix Air-Filter Adapter. Any advice would be greatly appreciated.