Hodge, Checked out his web page the other day and he is fitting a see thru panel in lid for 200 series landcruiser airbox ($750). Get a visual of filter. Must say though it is the down stream eg: cleaner side of filter but nice touch and you would see a discoloration as dirt accumulates.
https://scontent-syd2-1.xx.fbcdn.net...4b&oe=5C704F59
PM me the FB pages you are referring to re LS1