Wishlist FCS FCS 2 Compatibility Kit | Tab Infills Grub Screws | Turn FCSII into twin tab $17.95 FCS 2 Compatibility Kit | Tab Infills Grub Screws | FCS FCS 2 compatibility kit to fill the gap between the front tab of the original (dual tab) FCS fin and the front of the FCS 2 plug front slot. FCS 2 Compatibility Infills are designed to... Add to Cart Compare