Sorry - Yes Magic is right - I got it the wrong way around!
They will fit, but it would be like having 16mm spacers on the standard wheels - which is no bad thing as many people space the rear wheels out that amount anyway!
Apologies for tagging onto this thread but I have heard conflicting stories as to whether the Kerscher 'Fuchs" style wheels will fit a narrow body car.
Kercher say yes but when I was stood next to a set in Dinslaken at the FVD Brombacher stall the guys there said no, apparently the tyre that used to allow them to fit has been redesigned and the sidewall no longer clears ??
I would be pretty confident they would fit a narrow body car. They are wide body offset and 11" wide - the same width as standard, so would be the same as fitting narrow body wheels with a 15mm spacer - which many people do with no issues.
If I wanted to fill out the arches further on my narrow body car, I would rather use wide body rear wheels than narrow body rear wheels and 15mm spacers.