Jeff Kelly

Hi hope I have the correct place for this I have a 2003 Nissan Stagea running a VQ 25DD model GH-NM35. I changed the spark plugs a few weeks back but could only find 5 plugs in the last chamber there was no plug that was when I noticed that the coil to that chamber was different from the other 5 coils it was a lot shorter than the others can anyone tell me why this is & is the last plug under a sleave depper in the chamber.