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Here's my guess: The eccentricity-offset is designed to aid installation. My logic: Once the existing bushing is removed, the engine may shift very slightly forward or backward, since its upper support is now gone. With an eccentric bushing, it can be rotated in the housing to the position where it will accept the thru-bolt (which would make lining up the arrow a moot point, I suppose). Anyway, it's still going to find it's own position once you drive it for a while, because it's not a press fit.
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1998 S70 T5, 5-speed, 140k
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