I can't bend back the ears because they are cast into the motor housing. They're not bent over the back plate. If you click on the link to Fastlane below you can pull up the picture and see the motor:

http://catalog.peachparts.com/ShopByVehicle.epc?q=1979-Mercedes--benz-300sd-Climate--Control&yearid=1979%40%401979&makeid=63%40%40MERCEDES%2DBENZ%40%4063%40%40MERCEDES%2DBENZ%40%40X&modelid=6203%40%40300SD&catid=242213%40%40Climate+Control&subcatid=242321@@Heater+Motor&mode=PA

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13