I have an 85 6.9 with the banks Turbo. The air box says banks and 6.9 in the casting. It has the K&N Filter which was tweaked, and crushed and filthy. Looks like it was shoved in and the lid tightened down.
I took it to a couple auto parts stores looking for a paper replacement. They could not find a cross reference.
I did find a Banks K&N by searching on the part# on the filter. Ordered it doing a Google search, and it came from Banks. Maybe banks has a corner on these?
When I finally get around to putting it on the road, i`ll do some more searching to see about coming up with a different air intake. Iam not too wild about K&N Filters.
Soon as I finish this pot of coffee and reading through the Forum, i`ll head out to the shop and get the part# off the box.
Actually if you look on your K&N, there will be a part# on it.
Goat