What make was the standard blade.
It's a bit more complicated than you might expect. On the 2013 Kombi that I know is factory original, both blades are 24 inch.
The original factory driver's side blade is by SWF (who I've heard of but don't know well) - it's straight, 24" with a spoiler, and Bosch Superplus SP24S seems to fit that well.
The original factory passengers side blade is unusual in that it has no maker's mark, 24" long, but it's curved along its length. I have a suspicion that it may be custom-made for this application - I can't recall ever seeing an aftermarket curved blade. A straight 24" blade seems to fit OK, but the tip ends up right on the corner of the screen. A Bosch 24S blade would fit OK but we put on an Aldi £5 generic one and it has been absolutely fine.
Although the wiper arrangement on a pre-facelift is slightly different (they sit higher above the edge of the bonnet) our 2006 Kombi has exactly the same blades - a straight SWF spoiler blade on the driver's side, and an unmarked curved blade for the passenger.
To add another quirk, some vans come with a shorter blade on the passenger side - I don't think this is anything other than VW penny pinching, as AFAIK the max possible length is the same on all of them.