The rubber inside them is a different shape as they move in slightly different ways. One of them is almost solid, whereas one of them has a bit of a recess in the centre to allow more movement, although I can't remember which is which.
I don't think there are any of either of them left now.
Curiously the C5 A6 has almost identical bushes with steel shells. It might be possible to use these instead, but there's only a year left of C5 parts so it doesn't help that much.
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