Thanks Gent's,
Here's some cross references off that NGK #
NGK BPR6ES
Autolite 63
Autolite 4263
Bosch Obsolete Plug, WR7DC
Champion RN9YC
Denso W20EPR-U
Denso W20EXR-U
Denso Iridium plug IW20
Splitfire SF426C
Splitfire SF6C
Splitfire Platinum spark plug TP6C
Still can't find a thing crossing that Bosch (Mico) #.