This product has been discontinued by NGK. I am unable to find any more of this item but will continue to look for additional supply.
We do sell an NGK BPR6ES plug which is an identical spark plug with a resistor band. The resistor band simply protects against on-board computer systems from interference caused by sparking. As the 240Z and 260Z did not contain computer systems, the distinction between BP6ES and BPR6ES is irrelevant.
This is a set of 6 NGK BP6ES spark plugs which will fit any Datsun S-30 Z-car (240Z, 260Z, and 280Z).
These come pre-gapped at 0.031in (0.8mm), you will want to make sure you double check the gaps with a spark plug gap gauge that can accommodate the gap range that fits your exact vehicle. For more information on gapping your spark plugs, as well as more information on how to replace them, check out our Z-car spark plug replacement guide.