Fits on a ship (rigs + modules): Equipment Assembly Array
Loaded into a module (ammo, cap charges, scripts, etc.): Ammunition Assembly Array
Fighters & bombers: Small Ship Assembly Array
T3 Subsystems + T3 Hulls: Subsystem Assembly Array
Ship: use a ship array (typically the same size as the rig size)
Drones: Drone Assembly Array
Starbase & sovereignty structures, and containers, can only be built at a station or outpost.
Fuel Blocks: Ammunition Assembly Array and Component Assembly Array
None of the above: Component Assembly Array