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If it's the same as the E420, they are square. They can be hammered out and replaced with new nuts and bolts. Here's what it looks like new (pictures). The nuts install into the collector one way -- with the serrated edges facing up (away from the bolt). The round smooth part faces the bolt.
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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