How to install a bolt hopper

I can’t figure it out, I have a turret mount with a Scorpion ballista in it, and a bolt hopper in my inventory ready to install, but I can’t install it on my vehicle. Anywhere. I can’t even find a “hopper”, “magazine” or “ammo” named object in things I can install on my vehicle…can anyone help me figure this one out? Thanks.

Fairly certain that the scorpion takes ballista bolts, not crossbow bolts. Examine the tile the scorpion is installed on to reload.

Woops, the hopper is for crossbow bolts. My bad…how is there not one of these for ballistas on vehicles!

Magazine fed crossbows are a thing. As far as I know, there aren’t any magazine fed ballistas. And the mounted ballista already has a 12 shot magazine so I figured that was good enough.