My 05 wagon did this as well. I've found a solution that worked for me. What I did was I removed the clip from the trim piece. When you remove it you'll notice it has two slits on the tapered section. What I did was I took a small flathead screwdriver and forced it into each slit to flare it out. Now with the screwdriver still through a slit,take a lighter and heat up the plastic so it forms to the new flared shape you've created.when you remove the screwdriver it should remain flared out. Reinstall the clip and the trim piece and tada it's a secure fit. Hope this helps out!