Hi VM,
Couldn't clarify anything of the above as I won't use anything but "GENUINE" NGK plugs sourced from reputable retailers. If you want to pay cheapskate prices you'll more than likely get cheapskate plugs.
Basically it's that simple.
At least with a reputable outlet there's come back, something you just don't get from faceless sellers online that just take your money and laugh at you.
Cheers,
BB.
