Lee, he's not asking if the S3 grille fits the S-Line bumper he's asking if the S-Line grille fits the S3 Bumper. AFAIK the S3 Bumper will not take an S-Line grille, but the S-Line bumper will take an S3 Grille as you say with a gap across the top I thought. The fogs are also the same I checked on ETKA, however the fog grilles are not.
Joe