wheel spacer help!

I have a 2011 c350 4mati. I measured my wheel gapage for spacer my fronts were approx 1inch. (25mm) and rears were between 19-23mm. (measured from the middle of the wheel to the outside of the fender).
Any suggestions on what size spacers i should use? maybe 20mm?
and do these measurements sound right? im using the Stock AMG wheels from the 2011...
please msg back!
Attachment 444581



