I am new to this forum, or any forum for that matter, but I did research replacing the heater vents as they were all broken on my 2018 Defender when I bought it. I just figured out what I feel is an awesome and cheap fix. I don't want to spend time posting details and pics unless people need it given this thread seems several years old. Please let me know if anybody still wants this info and I will add my info to share with all. Thx