http://catalog.peachparts.com/ShopByVehicle.epc?q=1992-Mercedes--Benz-400e-Cooling--System&yearid=1992%40%401992&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6258%3AED|10000072%3AMBC|1530%40%40400E&catid=240909%40%40Cooling+System&subcatid=240911@@Radiator&mode=PD

I was able to find radiators for your car - you may want to compare part numbers with the one you got to the one listed here on the site. If I were you I'd return the odd-sized radiator and get the correct one from here, you should be able to contact Phil and verify the dimensions before ordering.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth