It looks as if you have the newer thinner drive flanges. I had this issue with fitting free style alloys.
It's a tight fit as the alloy locates on the outer edge of the hub, so clean the outer edge of the hub and drive flange; remove dirt, lumps of paint etc and also make sure the edges of the drive flange bolt don't protrude out from the sillouette of the hub. Once thats done they should fit.
Oh and make sure the inside of the wheel is clean and free from lumps of mud, dirt and paint!
Also you will need different wheel nuts, but I'm sure you already know that!
steve
Edit: Just looking at the picture agian it looks as if you might have the older thicker drive flange, so it maybe the case of different drive flange and half shafts or you could go down the route of wheel spacers?