Since it is difficult to find the correct Bosch, Beru, Champion and NGK non-resistor spark plugs, will any the following copper core plugs work:

Motorcraft - SP447
Denso - T20EP-U
Splitfire - CC0101D

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1986 300E (3/2002) Rear ended and totaled (10/2009)
2000 Xterra (5/2000)
1992 400E (11/2009) -Sold
1986 300E (12/2009) - Sold
2004 E500 Wagon (6/2013) - Sold