Don't worry, there are lots of numbers but it's easier than it sounds when written down. Generally E36/E46 3 series wheels are a straight fit, which is why the MVx series are OK.
I've tried to get close ups on the images in the adverts and I can see 255/35/18 tyre size markings on two of the tyres. This means at least 2 of them are rears! It would seem they are a staggered 3 series set. I would suggest a message to the seller and ask him for the exact dimensions of the wheels (stamped on the back) and the tyre sizes fitted to be 100% sure.
One of them is missing an ///M badge though which should be in the little depression by the stud holes.