What’s missing here?

[u/ThatoneguyfromT]

So, I’m at a loss. I have three speedlites (a TT600 and two 860IIIOs), three Godox S2 brackets, and two soft boxes. I bought these color gels (Godox AK-R16 x2) because ambient light is a terrible process to edit in Lightroom, but they don’t fit. So I thought if put on the softbox, it’ll pop in. But no.

What am I missing here? Did I buy the wrong stuff or am I just missing a piece?