Hi, I have the same problem on my wifes 1.4TFSI, ordered 2 replacement parts and rivets to secure them, 2 x trim £60.00 pair. Rivets x6 £12.00.
What a rip of the rivets cost pence so why £12.00.
The rivets are located under the door rubber trim, if you gently move it forward you will see them, they need drilling out but not sure if the trim will gently pull out, due to try this tomorrow. The new parts are painted and not coated like the old ones, may be worth trying to clean up the old ones and spray them.
Regards. David.e.c