Jezza I have a 1303 superbug and did manage to get the door chrome powdercoated black. It was not simple ! What I did was to remove the trim and take the small rivets out by drilling with a fine drill bit . Then the whole thing comes apart. Then they were powdercoated and I used small rivets again to crush the scraper felts back in place. You cant buy them separately as replacements they only sell the later modell ones as a set , so what I did was go to the automotive rubber supplier and get one that had the right profile and it does the job well. It is a bit of mucking around but it works ! Good luck.
