Pull out one of the bolts and look at it closely. You will find there is a step like a shoulder on it. Take it to the hardware store and get grade 8 metric bolts the same size and put those in. It should fix the problem. I went through the whole thing too replacing everything and not helping the problem till I looked at the shock mounting bolts.
I attached a pic of the bolt, Its not real clear but you can see where its worn, or made that way. I'm not sure which is the case.
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