I ran 15mm front and 15mm back spacers from Garageline on stock ND Club wheels on my first 124. I have run the Garageline spacers on two different ND's now, also. The first one I ran the 15mm front and 15mm back. The second one I ran the 15mm front, 20 mm back. The rear definitely looks better with the 20mm spacers over just the 15mm spacers.
The offset on all 124/ND wheels are the same, so those spacers will work and not rub with the factory 205/45/17 or 195/50/16 tires.
The offset on all 124/ND wheels are the same, so those spacers will work and not rub with the factory 205/45/17 or 195/50/16 tires.