Well bought a rear box off ebay and it fits like a glove - £44 delivered! Might not last for 10 years but neither may I!

http://stores.ebay.co.uk/Eternalcar_Exhaust-pipe-system_Mercedes_W0QQcolZ4QQdirZ1QQfsubZ6253871QQftidZ2QQtZkm
for those that want to know.
cheers
toby

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tobyd uk
94 E280T