Amazon is wrong.
I wonder why they think it does not fit 2008 but does fit 2009-2011. It might be because the 2006 2.4L originally came with 41-109 and nobody got around to changing the books.
The 2008 Owner Manual does state 41-103 for 2.3 and 2.4. It says 41-108 for SS, that is 5 mm (about 3/16 inch) longer for a slightly hotter spark.

 

Amazon must think the 2.0 SS will not take these plugs. Oh, they will fit just not perform well.

 

Check the specs on "your" current car in the "garage." Are you sure it isn't an SS?

Can't tell the item number from the screen shot. Is it a box of 8 or something? They might insist that it needlessly needs (hehe) to be the correct number.

Amazon seem pretty sophisticated about this stuff, may not be relying entirely on the vendors info, but if you double check Amazon's disagreement about correctness, just ignore it. It will let you order anyway.

 

Strange Amazon claims the 103’s fit a 2007 HHR but not a 2009 or 2010 or 2011.
I think it’s the supplier doesn’t have a clue what fits what. A 6 pack is $98.74 CDN or $16.45 CDN each

and RA has the same plugs for $8.48 plus shipping, you only need 4 so $33.92 pretty sure shipping won’t be $64.82 CDN . Just running the numbers.