The non-resistor copper plugs are hard to find. Buy more than one set when you do.

Bosch H9DC0
NGK BP5EFS (hotter)
NGK BP6EFS (colder)
Champion S12YCC
Beru 14 K-9 DUO
Beru 14 K-7 DUO (Z18)

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)