Take a look at this location....

http://www.volvospeed.com/pollenfliter.php (they call it a "pollen filter")

If it turns out that your car doesn't have one, an adapter kit is available to provide the mounting capability. This is the ipd location that shows the adapter as well as the filter.

850's were not all equipped with the filter and adapter.... I believe it was an option. But it works on all of them. Just follow Moregolf's recommendation, take a look at the pictures, then go have some fun. If these responses aren't enough, just re-post your question about the cabin filter and we'll try again.

Good luck

Marty
'96 855T