I take back my earlier post. Sorry. I just checked my Euro van parts catalog. While he early LT's and MB's are not the same, later LT's and Sprinters share the same chassis and mechanical components. The catalog did not indicate in which year they became clones of each other.

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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