I just ordered the conversion kit with plugs from Foreign Automotive Parts in Flint MI. 800-728-1601. He was selling a kit on ebay. The Bosch pin glow plug with the large threads that the loop type have is numbered 80035 in large letters on the box and in small letters 0250201044. The plugs were $15 each.

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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