NGK part numbers listing
How to read NGK spark plug codes
Denso part number/cross reference list
Denso reference sheet/additional info
K20A3 OEM part numbers
Honda 12290-PND-A01 REPLACED BY NEW PART NUMBER 9807B-5617W
Honda 12290-PND-A02 REPLACED BY NEW PART NUMBER 9807B-5615W
Denso OEM REPLACEMENT SKJ20DR-M11
NGK OEM REPLACEMENT IZFR6K-11
K20A2 OEM part numbers
Acura
98079-571BV (NGK)
98079-571CV (Denso)
NGK IFR7G-11KS
Denso SK22PR-M11S
Obviously K20A2 plugs are step colder that K20A3, so if you are looking for step colder plugs in an A3/CRV you want to run Type-S units.
If you're swapped (FROM and A3 to an A2/Z1/Z3) and are looking for step colder, these are the part numbers you need:
NGK
STOCK HEAT RANGE - BKR7EIX-11 - STOCK NUMBER 6988
1 STEP COLDER - BKR8EIX - STOCKNUMBER 2668
2 STEP COLDER - BKR9EIX - STOCKNUMBER 2669
Denso Iridium POWER
STOCK HEAT RANGE IK22
1 STEP COLDER IK24
2 STEP COLDER IK27
Denso Iridium Long Life
Stock Heat Range - SK22PR-M11 - These have .7mm electrode tip. Everything else may have a .4mm.
