Surfing Waves

Am I meant to screw these in?

Nope, those look like the right fins. But I think that's the wrong board.

Either:
A) Get single-tab fins that fit those weird (too small?) knockoff Future fin boxes; or
B) Get a board that fits those knockoff FCS fins you bought.

Apparently it was "made by humans" so you could ask some of those humans what fins actually fit that board. Good luck!

YES, those fins, if they fit down and snuggly in the box, will work. The design of the bandit maker box and ( fins which you don't have ) is to circumvent the two-tab patent of the FCS original fins.

One problem is those bandit boxes had grub screws that are slightly larger than those on actual FCS fin keys. If you use a real FCS fin key, it will strip and round out the grub screw.

WHAT CONCERNS ME MOST is the alignment you have in the photo. Looks like you need to rotate each fin to the next box Counter-Clockwise ( or anti-clockwise for Jaffa ).
The fin at the top belongs in the Left box. The fin at the bottom left ( which casts a shadow due to being double foiled), belongs in the rear center box. And the fin bottom right ( which doesn't cast a shadow as the flat inner foil is facing down, belongs on the Right box.

Here is if you had the opposite problem, having DFS single tab bandit fins but real FCS two tab plugs on your board.

Notice they give you a faint guide line to "modify" the base so you can fit them in to FCS plugs.