cabin filter location and replacement?

[electrofelix]

I want to replace my cabin filter, as far as I can tell it's not down in the kick well areas like most of the other E36's. I remember coming across a reference at some stage to the filter being under the grill in front of the windscreen, but can't find any links to support this.

In other words I believe that this is the microfilter in my car:
http://bmwfans.info/parts/catalog/E36/Coupe/Europe/318is-M42/RHD/M/1992/september/browse/heater_and_air_conditioning/microfiltre_microfiltrecover/

While the rectangular one that is accessible via the kick well areas is for cars with A/C. Mine is heater only.

Anyone got a link to a DIY so I'll have a chance to confirm my suspicions before removing the grill area?