Gasket maker is the only approved sealant, and it must be the red stuff from the dealer. Do a search, it'* posted here. There are no gaskets available, and I wouldn't trust one with that nasty oil.
You'll need slightly more than one bottle of oil for an M62, so buy 2, and you'll have some spare to carry around.
You can try to do it without pulling the SC if you like, but I'd rather do that than remove the entire accessory bracket and tensioner.
You'll take twice as long and curse yourself for not just removing the SC.
The Series 2 can do just the nosedrive, as the ND is not studded to the alternator bracket on that series. Look at the bright side, at least we don't have to disconnect a motor mount to change a belt.
I can do the R&R in under 2 hours now. And I'll be doing it soon on my 95.
I also suggest replacing the fuel injector O-rings at the same time.