I've got a 1992 400E dif taking up space . I think the rear cover has cooling fins on it, unsure if it will fit your dif or chassis. If your homework says yes, $22 for the rear cover (includes shipping)

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Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
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'05 E500 Wagon