Looking at sourcing parts from wreckers, wondering if it was worth my while adding them to the list. Likelihood is I will be taking out the roof lining to work on my aerial and stuff, thought why not

It looks like they run along a rubber strip on the roof regardless of whether it has racks or not. I will likely have to at least partially remove the roof lining to get at the aerial socket as it's raised from the roof and potentially letting water in.
From this:

To this (well, almost lol):
