I'm dreading one of my dipped beam Xenon bulbs going
One of bulbs is ever so milkier than the other on close inspection although the beam is balanced and doesn't differ in colour or contrast, so I'm probably being picky. Jay (JPC) noticed this when fitting them for me.
I'm not sure how you'll get on with replacing just one as I've heard people quote before that two never actually 100% match, unless they're both OEM or both aftermarket etc... That may be inaccurate, but it probably would help if you know the source of your other current dipped beam bulb.
Tried VW for a price? They won't be the cheapest I'm sure but worth it for a benchmark.