OK plan b supplier ....
https://www.engineeringcarbonproduct...on-brushes.php
I won't use them even though they are a UK supplier as their postage rates to Europe are so inflated and in my opinion unfair. You'll also find that you have to order a set of four even though you probably only need one or two.
My latest 75 saloon had a wet boot too which I found came through the rear lights. The seals had split (very common) and allowed water to drain in, I stitched (one only) the broken ends together and then used glue to finish the joint. They've been fine since.
Regards