What is with some people and bosch plugs? So what if they come on a VW the also come on MB and Porsche, etc. Now that being said, I wrote platinum not platinum+4, there is a $3/plug difference. I like the inexpensive ones. AC or bosch seem about the same quality and $. I've got one set of each in each of my 'burbans. Jarhead got the indexing right. You can mark the plug, inline w/ side electrode w/ a marker, to see it's relation to combustion chamber. There are a few co. that sell the washers, or just buy a bunch of plugs and start swapping them around to get them to line up, w/ side electrode near top of comb. chamber, most spark open to chamber. Sidegapping is when you trim the "L" part of the electrode to be just "l" and gap between the side of center electrode and the now vertical side electrode. You can trim w/ a good set of clippers or grinder, whichever you prefer. I like clippers cuz you get a nice sharp edge on electrode and no burrs. The spark will always jump between the sharpest/highest points on electrodes. This is why old plugs get rounded electrodes and need to be replaced. Thats the only reason, other than additives/crap building up on electrode, to change plugs. Sidegapping opens up more spark to combustion chamber. Try it w/ some good inexpensive plugs, just make sure gap is the same as you normally gap, me:.045-.050in. Just bend the side electrode like you would for reg. gap. Try it you might like it, if not you're only out $16 and an extra 10 min.
