Christopher Tidy wrote:
....
Anyone got one they want to sell, or know where I might find one? I'm
looking for this specific air cleaner, or one very similar, not one
which does the same job.

It looks VERY much like the Gravely oil bath cleaners:
http://cgi.ebay.com/GRAVELY-L1-OIL-B...QQcmdZViewItem
or
http://tinyurl.com/ca3mqd

I can take a better picture of mine and/or measure it if you want.

Bob