B16 (Gen II) plug # is : Nissan:#22401-JA01B Densoiridium) FXE20HR11

FXE20HR11. FXE22HR11. FXE24HR11
12mm dia. X 26.5mm length long reach shroud type.
For Nissan
Gap should be 1.1mm (.044")

side info for boosted B16 (Gen II QR's)

FXE22HR11 = Nissan Part #: 22401-EW61C (1 step colder plug)

FXE24HR11 = Nissan Part #: 22401-JK01D or 22041-JK07D (2 step colder plug)