Can't see to find the guide but it's a piece of pi$$!
You will need a trim tool to remove the top vent on the dash, once out this will expose a screw at the back of it, then the top part of the dash will un-clip including the top vents. This will then expose the srews for the lower dash around the heather controls and then the stereo!
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If Stealth can do it, anyone can!
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