this is the info i dug up a while ago, from the bentley book and from
asking the guys down at the flaps to look in their catalogs:

(All Models, Buses and Vanagons, 1968-1991)
SPARK PLUGS:
   Air-cooled engine, codes B, AE (1968-1971)
                    Bentley Book            FLAPS
        Beru        145/14
        Bosch       W145T1
        Champion    L88A
        NGK                                 B5HS
                                            BR5HS (resistor)
   Air-cooled engine, codes CB, CD, AW (1972-1974)
                    Bentley Book            FLAPS
        Beru        145/14/3
        Bosch       W145T2
        Champion    N88
        NGK                                 B5ES
                                            BR5ES (resistor)
   Air-cooled engine, codes ED, GD, GE (1975-1979)
                    Bentley Book            FLAPS
        Beru        145/14/3L
        Bosch       W145M2                  W8CC
                    W8CO                    W7DTC <3-pronged>
        Champion    N288                    N11YC
                    N5C <replaced N288>
        NGK                                 B5ES
                                            BR5ES (resistor)

   Air-cooled engine, code CV  (1980-1983, California models included)
                    Bentley Book            FLAPS
        Autolite                            394 or 404
        Beru        145/14/3L
        Bosch       W145M2                  W8CC
                    W8CO                    W7DTC <3-pronged>
        Champion    N288                    N11YC
                    N5C <replaced N288>
        NGK                                 BR5ES
                                            BP6ET <3-pronged>

   Water-cooled engine, code DH (1983-1985 Digijet models)
                    Bentley Book            FLAPS
        Autolite                            403
        Beru        14L-7C
        Bosch       W7CO                    W7CCO
                                            W7DTC <3-pronged>
        Champion    N288                    N11YC
                    N5C <replaced N288>
        NGK                                 BR6ES
                                            BP6ET <3-pronged>

   Water-cooled engine, code MV (1986-1991 Digifant models)
                    Bentley Book            FLAPS
        Autolite                            403
        Beru        14L-7CU
                    14L-7C
        Bosch       W7CCO                   W7CCO
                                            W7DTC <3-pronged>
        Champion    N288                    N11YC
                    N5C <replaced N288>
        NGK                                 BR6ES
                                            BP6ET <3-pronged>

GLOW PLUGS:
   Water-cooled engine, code CS (1982-1983 Diesel models) **Glow Plugs**
                    Bentley Book            FLAPS
        AC                                  31G
        Autolite                            1104
        Bosch                               0250-201-021
                                            0250-201-032
        Champion                            CH69
        NGK                                 Y901R

sorry i don't have anything for the older-than-68 buses, but if someone else
has this info and wants to put it on the list, i'll be glad to add it to
this pile of bits. :)

joel