I wouldn't touch Vauxhall wheels since they are very particular indeed. Their offset is NEGATIVE 49mm i.e. ET-49mm not ET49mm
You will seriously bugger your dynamics if these will fit at all.
Remember that offset is very important if you want to keep the finely tuned driving characteristics of your cars. On a 2.0L 16V the offset for the 7X16" alloy wheels is 40mm if you remove the spacer fitted between the hub and the wheel itself (this being 5mm thick) you can fit 35mm offset wheels, these being a lot more popular.
You can also fit 4/100PCD wheels with special bolts to adapt for the difference in PCD.
PLEASE PLEASE PLEASE check what your offset is before chucking a lot of money away!!! Millimeters make a hell of a difference in this game.