Yesterday I finally got round to replacing the front passenger wheel arch liner and the piece of underbody trim that it locates into with all new fixing screws. See the photo with the yellow arrows to see the rattle causing area I'm talking about. Note the "arrow photo" was taken before I'd replaced the underbody piece of locator trim.
All in the hope that new plastic trim (with no warp or wear) will stop the wheel liner's locator tab popping out, vibrating and causing my rattle in the passenger footwell at 65+ MPH.
Initial test drive on dual-carriageway at 70 MPH and the rattle is gone from the bottom of the A-pillar!
. Fingers crossed this is it finally sorted and I can have peace and quiet on my commute to work.
@joe6, sorry to hear you're still trying to locate your dash rattles
. Though I think your tactic to replace the door card clips is a good call. A tedious, but necessary process of elimination in catching the rattle sounds bouncing round the cabin.