98impreza

I bought bosch platinum 4's along with a bunch of other things to do a standard tune up. This will be my first time changing the plugs on this car and when I pulled off the plug wire I found some strange spark plug that a standard 5/8 spark plug socket would not fit. Does SubarU use some funky plugs from the factory or could they be from the previous owner changing them. I have no way of contacting the previous owner to find out. Any help would be appreciated, thanks.

Jolly Green Monster

iTrader: (4)

should be NGK PFR6B as standard.

Simon