had a look in the hand book and I cannot see any x ref to allowable tyre sizes ?@!] where did you get the 7J X16 X ET45 from?? = 205/55-r16-91V ?
Checked the Seat website and looked at the PDF Exeo
brochure which shows that an Exeo S has ;
WHEELS
16" ‘Dante’ alloy wheels + 205/55 R16 91V tyres
Brake size is - Front brakes (mm) 288 X 25 on all except TDi170
Wheel spec from this site;
http://www.wheelfitment.eu/steekmaat.php?merk=Seat&type=Exeo&merk2=Seat
which shows PCD 5x112 , 57.1mm bore & 45 offset.
Not really bothered that they are basic steel wheels as the purpose is to keep mobile in the snow that will ultimately appear this winter and I have a couple off weekends away at end of Nov & early Dec and want to get there without worrying about getting stuck with the normal tyres. (Had to cancel two trips last year)
They can be taken off & put on easily by me instead of having to pay the tyre centre to swap over when winter is over, kept in garage & put on again next winter.
Will let you know when they arrive and update as weather gets worse & I use them.