is what I mean... So the two portions need to be purchased together to be in balance??

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Mine: 1987 MB 420 SEL - 66K (Dec 2019)
Mine:1991 MB 350SDL - 244K (Aug 2011)- Totalled 9/14/2016
Mine:1981 MB 300SD - 326K mi (July 1997)-sold
Wife's: 2008 MB C300 Sport - 110Kmi (April 2009)