Having just changed the spark plugs on 2011 Si I noticed the difference in electrode arrangement on the IZFR6K13 and DIFR6D13 (original OEM plugs).
Attached is a photo showing this, the plug on the right is the ones I have just taken out of Jazz (DIF), the plug on the left is one from my Civic but electrode arrangement is the same as IZFR6K13 I got from Opie for Jazz, plugs are equivalent in heat range and everything else (see my earlier post above).
The spark plugs came out easily and no real drama removing the wipers and other stuff, some of the screws were a bit tight due to corrosion but not a problem, the blue clips come out cleanly as long as you pull the plastic away from the bottom of windscreen first and don't try to lift it from the engine side, which puts a side load on the clips. I did not remove wiper motor, just undid screws holding the rubber feet and eased the metal tray from under it. I did notice water had pooled under wiper motor and drilled a 6mm drain hole in what I judged to be lowest point of the tray underneath. Gave the motor and aluminium bracket a good coat of ACF-50 spray (use it on my motorbike), and also inside the electrical plug / socket.
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