Here is a link from the archives, with photos. 1995 E420 A/C air flow & dust filters
I don't think they were ever able to put the time into writing a DIY article - they started work on their shop and got real busy. Maybe if you email them they will have directions, and you can do a picture essay for the DIY section!
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E