In the past ive used the NGK ones with the 4 like you say, but last week I ordered some off GSF for my 16v.
Got the parcel yesterday to find 4 Bosch ones. They have a Platnium Electrode with one - not four.
On the pack, it says the gap is 0.6mm. Not sure if this is what its meant to be, but im putting them in when the weather is good.