What plastic clips do you mean? Can you get a picture please?
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This is just a picture off google showing the clip im talking about. The very right hand back seat. The belt is tucked under the clip thing. This is what stops the rattles you describe for me. Its just a pain everytime you have backseat passengers who dont tuck the belt back in I am half way through driving and the rattle annoys me so much I need to pull over and sort it