If those glow plugs are in series (which I think you imply), you should have the loop type plugs in it (I think). The end should not look like a pencil but a loop of metal. But I don't understand how you could get the heavy wires attached to the pin type plugs. It's possible to upgrade that engine to the pin type, but it that is done, each plug should have a separate wire going to it and it should not be connected to the other plugs.

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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