Right - my final post on this matter. Just a few of the "gotchas" I picked up during this process.
1: The plastic trim bits make use of two different types of male pins. White pastic ones, and black plastic ones. The black pins are used in all the circular female clips (one per piece of trim). The white pins are used elsewhere.
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2: The trim bits use three different types of female clips. There are oval shaped ones, a single circular clip per trim piece, and a weird, 45-degree angled bit for each of the trim pieces which sit on the door. The circular and oval ones are easy to get. I've not tracked down the 45-degree angled ones yet, so when removing the trim from the back doors be very careful not to break / lose them.
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3: Every piece of trim has a single circular female clip with a black pin which fits into this. I think this is more-or-less a "key" mounting point. I discovered that the trim generally comes off easier if this pin is removed first, as it is easier to shift the trim around a little once it is out (the rest of the pins are all in the oval clips, which allow a little more movement). When refitting the panel again, it is easier to clip in all the white pins first, and clip in the black pin last, for the same reason. I've highlighted their locations below. You will notice the patch of rust on my fender - I'll explain about this later.
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4: The trim on the door has a screw which first needs to be removed from the inside of the door. There is a plastic cover stuck under the opening. Remove it, and simply remove the bolt.
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5: My vehicle is old. The trim is relatively brittle. So be very careful when removing it. I broke a couple of clips on the inside of the trim when removing stuff. The stuff breaks off relatively cleanly, and it is easy to fix, so I'd suggest having some decent epoxy around in case this does happen.
6: As David mentioned, he found that silicon did not work particularly well (presumably because of the long curing time). I found that it worked fine - provided one gave it enough time to cure steadily. I used "mamma se haar-rekkies en wasgoed pennetjies". Basically, I removed the trim in the morning and cleaned everything up. After that, I stuck the new beading to the trim, and left it for the rest of the day to cure nicely. The afternoon, I put everything back again.
7: The rust... My vehicle has done quite a bit. Whilst I look after it very well, it does it's fair share of trails, dirty roads and similar. It gets cleaned regularly though. The thing that scared me was the amount of mud which had built up inside the wheel arch over time - there behind the piece of plastic which keeps it sealed. No idea how it gets in, but this would probably be how the rust inside the plastic trim on the front fenders started. It's something I need to address. I've oiled it and similar, but this is beyond my painting skills, and I'll need to take it somewhere to be fixed properly. I could have planted potatoes inside my wheel arches... :(
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Anyways, that is that. Ultimately, it's not a difficult job, but don't be in a rush to do it.
Clip count per arch:
Rear fender trim
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Black male clips: 1
White male clips: 5
Oval female clips: 5
Circular female clips: 1
Rear door trim
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Black male clips: 1
White male clips: 2
Oval female clips: 1
Circular female clips: 1
45-degree female clips: 1
Front door trim
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Black male clips: 1
White male clips: 6
Oval female clips: 6
Circular female clips: 1
I bought 12M of trim, and I guess I have about 2.5M left. So work on a reasonably amount of trim...
Hope this helps someone