You don't say which car it's for, but the part number for your 89 W124 is 124-626-00-42. The epc refers to it as a "battery rail". Price is about $3.50 from Internet parts houses. If the forum sponsor MercedesShop.com can't supply it, try http://www.trademotion.com/partlocator/index.cfm?siteid=214269

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't