"On the less positive, they only did the top and bottom of the trim."
If you're meaning: Only 2 of the 4 holes on each side modeling, have rivets securing to them to "A" pillar.. Be very pushy!
All hole must be filled/sealed. Or water will get in. Additionally, No glue (black ploy) should be...
The reason we do not like metal screws holding molding in. The metal screws, break thought factory paint in/at side of holes, and cause rust in "A" pillar.
Toyota does have various size aluminum plastic coated rivets. Just visit the parts counter and ask what they can find. I've found...