James - If you'd like to keep the original look of the oil bath cleaner (similar to what JW51 did), here's a
Legacy Air Filter Upgrade TechTip from back in April of 2016.
It's still a valid way to convert your setup to a paper style filter and keep the original appearance. There are other threads over the years that other folks have done something similar. You can find them by using the
Stovebolt Search.
If you are set on changing the full housing and getting something with the diameter you mentioned, it will probably entail some fabricating as the only current type of aftermarket dry filter setups are all on the small side, like these offered by
The Filling Station. All are only about 4" diameter overall. You could use the base and try to adapt it to work with a larger diameter filter assembly if that's the look you're interested in.
