CKS stuff is all just imported from Taiwan. So just check it's not cheaper elsewhere.
Search Godhand spoiler on E Bay or if your looking for high end stuff check out Vorsteiner etc.
Just my opinion but I think they spoil the lines......however others will say it looks the dogs balls.
Try SSDD Motorsport. Again it's all imported and CF overlay on FRP but fitment is pretty spot on from what I've seen. Their website promotes themselves as BMW only however, if you call or email they have connections to supply Merc stuff.