I purchased a trim piece from fcp groton www.fcpgroton.com, but don't recall if the clips/mounting hardware was included or if that's a separate item (I stll had all the pieces from the old trim). Give the guy a call/email to find out, he's great.
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'97 850 n/a Wagon, 145K mi

The first question is did the existing clips break? Clips are almost always a dealer item. The door trim has several clips that slip into the holes in the door and then you slide the trim toward the rear of the car. Then there is a screw which attaches to the rear most clip (which is different than the other clips). When you look at the inside of the door, there is a round cover which is popped off to access the screw (torx). If your clips are missing, it may be because the moulding has been "hit" and distorted so that they disengage from the rails. In that case it is probably better to just get the entire moulding strip from the dealer. It should have the clips attached. You may also need the screw it that is missing. If your moulding strip is in good shape and you just need the clips, post a reply giving specific details on your 850, (i.e. year and model - if a '94 early or late), and I can give you the Volvo part numbers.