I sold my 2012 IPL stock springs on eBay and the seller is trying to return them saying they don't fit his 2008 coupe. Searching, I see groups of springs for 09-13 and 08-13. Is there some reason why his wouldn't fit?

 

They should fit. Can anyone else confirm?

See if this link helps any:
https://www.myg37.com/forums/brakes-...l-springs.html
https://www.myg37.com/forums/brakes-...ngs-ipl-s.html
https://www.myg37.com/forums/brakes-...-for-g37s.html