Can I put 18" Serron Wheel (From GTI Autobahn edtn.) on new 2012 Passat

[CNGracing]

NEED HELP! I am looking to put a new wheel onto the 2012 Passat I am getting. I do not like the 17" or the 18" option they have for the Passat. I actually do like the 18"Serron wheel even though it looks as if GTI owners don't. I do not know much about offsets but I know they have the same 5 x 112 bolt pattern. I went to a dealership to ask if I the Serron Wheel can fit on the 2012 Passat, and they said no because the GTI wheel had an ET51 and the passat wheel had an ET48. I asked what that meant and they said...it means it won't fit. I asked what ET meant and they couldnt get me an answer so I think it means Extra-Terrestrial

. So if I can be enlightened with some knowledge from fellow tdiclub members, it would be greatly appreciated. I dont want to get a wheel that doesnt fit. FYI, I ordered a night blue/black interior TDI manual so I liked the way the black glosssy wheel looks. Thanks
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[740GLE]

Only real 100% way to check is fit em up and check for rubs. A change of offset (ET, the distance the rim sticks out from the hub) that small (3mm?) probably would have no rub.

 

[abctdi]

3mm should not make or break that deal...assuming they are the same width.