I have the issue Of "Star" magazine that features a very detailed description of how to install the European HLs. If you need I can make copies and fax them to you.
I'm not positive but, I don't believe Xenons will work in those HLs.
You can get any wattage bulb that you want. Even the factory bulbs will fit. The article I mentioned goes to the extreme by having the capacity to burn low beams, high beams, and fog lights all at once.
Yes, you get foglights.
That's correct. The European HLs are bulkier I believe and the US HL wipers won't work. You can get the replacement panels that go under the HL without hole for the wiper shaft.
92 Volvo 740 Wagon aka "Mutt mover"