I did one on my mk1a in April.
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I had the front bumper off at the same time
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(as it was being repaired) but you dont necessarily have to remove it.
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Its just a bit fiddly getting to the bolts that hold the wing to the slam panel.
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2-3 bolts on slam panel
1 bolt at bottom of wing on side skirt
1 bolt at top near windscreen
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4 along the top
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An idea to remove the arch liner as well, as it gets in the way a bit
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May need to take the front part of the side skirt off, as it helps for manueverability when putting it back on, unless you have the model with no side skirts of course.
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Fairly easy to do.
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I did mine in half an hour