Here is an air cleaner option for six pack owners

You must be the only guy on the planet that has that number? Nobody makes a drop in filter for it, there is a K&N that works but any paper filter needs to be modified.

Give me a day or two and I will look for the number, and will try to order one before I post the number.

I hope you are not right that the filter is obsolete.
But good to know the K&N can be made to work.