Originally Posted by ernster500

Here is my previous '04 RK Custom. I had an SE Air Cleaner on it that I simply removed the stock cover and the HD air cleaner inserts fit perfectly over the top of the air cleaner element and bolt exactly where the stock air cleaner would have...




As far as Arlen Ness, I have their Big Sucker Derby that actually accommodates any derby cover. I don't think they have an adapter as this is actually a whole differently shaped element/part from their regular big sucker.



Hope that helps a little!

E