Meaner Cleaner replacement filter part type

[stuartrubin]

I've got one of these air cleaners on my 34 ADF carb:
http://midwest-bayless.com/p-1176-meane ... 1-new.aspx

I think I need to replace the filter component. Does anyone know the specs, part num, etc. for this filter so I can buy just that? Is there a "generic" part for it? I started to look at the parts stores web sites, but there are thousands of filters...

Thanks

Stuart