That's actually what I wanted to say in my reply to dm_td5's post!
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Your better off getting a Rivnet gun to fit them rater than the bit of steel and nut and bolt tool LR supply in the kits. I just fitted a roof rack ladder to mine, ladder came with this fitting tool. I would think fitting them without the gun will scratch hell out of your paint
Allan
The Rivnuts don't add to the height, but the foam underlay doesn't help.
On a td5 drivers side you can take the vent plate thing off and get your hand in to get the nuts on, the other side required pulling too much stuff out for me so just drilled the holes smaller than the bolt and they just tapped into the bodywork. If they come loose then I will address it then but they have been on for ages now and all good. A bit rough but it worked. I did the same on the rear arches on the 90. I have banged them heaps off road and still good as gold.