One clip broke, and deal says I need to replace the entire thing??

stansens

I would use a good amount of clear silicon inside and remove any excess that squeezed out. This will hold it in preventing rattles and make it so it can be removed if necessary. That clip is the only one that is accessible without removing entire pillar. Just be sure to give the Silicon several hours to cure maybe using Masking tape to secure it in the exact position you want. Hope that helps.