Single electrode plugs in 2.4 engine?

So, I bought a set of NGK laser iridium spark plugs #4996 A quick reference to the owners manual tells me to use double electrode plugs.

The NGKs I bought are supposedly OEM equivalent, but they're single electrode.

Should I send the plugs back and go with stock? I've actually been running single electrode plugs for the last 30-40k miles with no issues, and the plugs I replaced those with were also single electrode plugs. Engine seems to run fine.

Has anyone else used plugs like mine in a 2.4? Any difference vs stock? I know they use iridium in the newer Tacos.

 

this is what I use in my 2.4L engine as per the service manual: NGK (2460) BKR5ES Standard Spark Plug
http://www.ebay.com/itm/Spark-Plug-...Parts_Accessories&hash=item43c36b886a&vxp=mtr

these plugs last just as long as all those fancy more expensive plugs and my engine doesn't run any better with higher priced plugs in it.