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Yes it's metric, either 8mm or 10mm. it's on there tight and you need a long L shaped. Take the bent part of the allen key place it in a crescent wrench to act as a lever... that should do the trick. Keep a pan under there while you do it, oil will drip out.
Once the bolts are are out, you get the lower boots off by basically holding the leg and in a hammering motion pulling the lower off. The rubber seal will separate while you do that. Then they'll slide right off.
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