Does anyone know what motor these are intended to be used for?
I think it’s either CA, SR or KA.
Any help would be appreciated, thx! 
I’d have to say SR20DE “G20” as it uses a heat range 5
If you tried running them in a DET, it would run like ass cause its to hot of a plug
But I went on ngk.com quick
NGK - PLFR5-A11
Automotive Fitting:
Vehicle Displacement Engine VIN
INFINITI FX35 (2005) 3.5LV6 VQ35DE
INFINITI FX35 (2004) 3.5LV6 VQ35DE
INFINITI FX35 (2003) 3.5LV6 VQ35DE
INFINITI FX45 (2005) 4.5LV8 VK45DE
INFINITI FX45 (2004) 4.5LV8 VK45DE
INFINITI FX45 (2003) 4.5LV8 VK45DE
INFINITI G35 (2005) 3.5LV6 VQ35DE
INFINITI G35 (2004) 3.5LV6 VQ35DE
INFINITI G35 (2003) 3.5LV6 VQ35DE
INFINITI I35 (2004) 3.5LV6 VQ35DE
INFINITI I35 (2003) 3.5LV6 VQ35DE
INFINITI I35 (2002) 3.5LV6 VQ35DE
INFINITI M45 (2004) 4.5LV8 VK45DE
INFINITI M45 (2003) 4.5LV8 VK45DE
INFINITI Q45 (2005) 4.5LV8 VK45DE
INFINITI Q45 (2004) 4.5LV8 VK45DE
INFINITI Q45 (2003) 4.5LV8 VK45DE
INFINITI QX4 (2003) 3.5LV6 VQ35DE
INFINITI QX4 (2002) 3.5LV6 VQ35DE
INFINITI QX4 (2001) 3.5LV6 VQ35DE
INFINITI QX56 (2005) 5.6LV8 VK56DE
INFINITI QX56 (2004) 5.6LV8
NISSAN 350Z (2005) 3.5LV6 VQ35DE
NISSAN 350Z (2004) 3.5LV6 VQ35DE
NISSAN 350Z (2003) 3.5LV6 VQ35DE
NISSAN ALTIMA (2005) 2.5LL4 QR25DE
NISSAN ALTIMA (2005) 3.5LV6 VQ35DE
NISSAN ALTIMA (2004) 2.5LL4 QR25DE
NISSAN ALTIMA (2004) 3.5LV6 VQ35DE
NISSAN ALTIMA (2003) 2.5LL4 QR25DE
NISSAN ALTIMA (2003) 3.5LV6 VQ35DE
NISSAN ALTIMA (2002) 2.5LL4 QR25DE
NISSAN ALTIMA (2002) 3.5LV6 VQ35DE
NISSAN ARMADA LE (2005) 5.6LV8 VK56DE
NISSAN ARMADA SE (2005) 5.6LV8 VK56DE
NISSAN ARMADA SE OFF-ROAD (2005) 5.6LV8 VK56DE
NISSAN FRONTIER LE (2005) 4.0LV6 VQ40DE
NISSAN FRONTIER NISMO OFF-ROAD (2005) 4.0LV6 VQ40DE
NISSAN FRONTIER SE (2005) 4.0LV6 VQ40DE
NISSAN FRONTIER XE (2005) 2.5LL4 QR25DE
NISSAN MAXIMA (2004) 3.5LV6 VQ35DE
NISSAN MAXIMA (2003) 3.5LV6 VQ35DE
NISSAN MAXIMA (2002) 3.5LV6 VQ35DE
NISSAN MAXIMA SE (2005) 3.5LV6 VQ35DE
NISSAN MAXIMA SL (2005) 3.5LV6 VQ35DE
NISSAN MURANO (2004) 3.5LV6 VQ35DE
NISSAN MURANO (2003) 3.5LV6 VQ35DE
NISSAN MURANO S (2005) 3.5LV6 VQ35DE
NISSAN MURANO SE (2005) 3.5LV6 VQ35DE
NISSAN MURANO SL (2005) 3.5LV6 VQ35DE
NISSAN PATHFINDER (2004) 3.5LV6 VQ35DE
NISSAN PATHFINDER (2003) 3.5LV6 VQ35DE
NISSAN PATHFINDER (2002) 3.5LV6 VQ35DE
NISSAN PATHFINDER (2001) 3.5LV6 VQ35DE
NISSAN PATHFINDER ARMADA (2004) 5.6LV8
NISSAN PATHFINDER LE (2005) 4.0LV6 VQ40DE
NISSAN PATHFINDER SE (2005) 4.0LV6 VQ40DE
NISSAN PATHFINDER SE OFF-ROAD (2005) 4.0LV6 VQ40DE
NISSAN PATHFINDER XE (2005) 4.0LV6 VQ40DE
NISSAN QUEST (2005) 3.5LV6 VQ35DE
NISSAN QUEST (2004) 3.5LV6 VQ35DE
NISSAN QUEST S (2005) 3.5LV6 VQ35DE
NISSAN QUEST SE (2005) 3.5LV6 VQ35DE
NISSAN QUEST SL (2005) 3.5LV6 VQ35DE
NISSAN SENTRA (2005) 1.8LL4 QG18DE
NISSAN SENTRA (2004) 1.8LL4 QG18DE
NISSAN SENTRA (2004) 2.5LL4 QR25DE
NISSAN SENTRA (2001) 1.8LL4 QG18DE
NISSAN SENTRA (2000) 1.8LL4 QG18DE
NISSAN SENTRA CA (2003) 1.8LL4 QG18DE
NISSAN SENTRA CA (2002) 1.8LL4 QG18DE
NISSAN SENTRA GXE (2003) 1.8LL4 QG18DE
NISSAN SENTRA GXE (2002) 1.8LL4 QG18DE
NISSAN SENTRA LIMITED EDITION (2003) 2.5LL4 QR25DE
NISSAN SENTRA S (2005) 1.8LL4 QG18DE
NISSAN SENTRA S (2005) 2.5LL4 QR25DE
NISSAN SENTRA SE-R (2005) 2.5LL4 QR25DE
NISSAN SENTRA SE-R (2004) 2.5LL4 QR25DE
NISSAN SENTRA SE-R (2003) 2.5LL4 QR25DE
NISSAN SENTRA SE-R (2002) 2.5LL4 QR25DE
NISSAN SENTRA SE-R SPEC V (2005) 2.5LL4 QR25DE
NISSAN SENTRA SE-R SPEC V (2004) 2.5LL4 QR25DE
NISSAN SENTRA SE-R SPEC V (2003) 2.5LL4 QR25DE
NISSAN SENTRA SE-R SPEC V (2002) 2.5LL4 QR25DE
NISSAN SENTRA XE (2003) 1.8LL4 QG18DE
NISSAN SENTRA XE (2002) 1.8LL4 QG18DE
NISSAN TITAN (2004) 5.6LV8
NISSAN TITAN LE (2005) 5.6LV8 VK56DE
NISSAN TITAN SE (2005) 5.6LV8 VK56DE
NISSAN TITAN XE (2005) 5.6LV8 VK56DE
NISSAN XTERRA OFF-ROAD (2005) 4.0LV6 VQ40DE
NISSAN XTERRA S (2005) 4.0LV6 VQ40DE
NISSAN XTERRA SE (2005) 4.0LV6 VQ40DE
thanks!