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It sure looks like it's a lesser job to make this work than the 07/09 GT500 chin on a same year GT or CS, like a few folks (and myself) already have done here.
I can't remember the brand name but it is PVC foam board, comes in black or white, is light weight but strong. Available in shops that sell plastic, abs, lexan sheets. Cost is about $100 for an 4x8 sheet. I make a cardboard template and use pop rivets to hold it the bottom of the spoiler. I have been using that stuff for 20 years it holds really well even takes a scrap or two doesn't shatter just wears away is flexible and will bend if you apply heat and can be glued with PVC pipe glue and primer. I use the stuff 1/4inch thick. Edges can be sanded with sand paper for rounded edge. Use large head 3/16 pop rivets and back up washer on the tip end.
It sure looks like it's a lesser job to make this work than the 07/09 GT500 chin on a same year GT or CS, like a few folks (and myself) already have done here.
I'm still trying to figure out how to get it to fit my CS.
But on topic, they do look very similar. If it's not to much get em and test fit em and just hope it fits.