I can't seem to find any non-resistor plugs here. The dealer's supply has disappeared and most auto parts stores simply don't know the difference! I found some NGK BP5EFS from the UK. Will they work okay in a North American engine or will they have a different heat rating?

http://cgi.ebay.ca/3712-BP5EFS-NGK-SPARK-PLUG-X-1-LOW-PRICES-/160426164751?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item255a25020f#ht_3367wt_991

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1989 300CE