Which file controls what kind of deployable a ship could use?

[Spectre01]

I'm using someone else's ship mod. But for some reason, it could only deploy Laser Tower MK1 and not MK2. I want to edit it in. But couldn't figure out which file or wich part of the ship macro files control this. I couldn't find any obvious parameters in this ship macros files. Could someone give me some pointer?

[Rothank]

Mk1 lasertowers are XS size, so they are deployable through airlock.
Mk2 lasertowers are, functionally, S ships. You need a ship with at least one S pad or S launch tube, as well as internal S ship storage for that.

[Spectre01]

Mk1 lasertowers are XS size, so they are deployable through airlock.
Mk2 lasertowers are, functionally, S ships. You need a ship with at least one S pad or S launch tube, as well as internal S ship storage for that.

Oh so that's why. I was used to flying the Cobra but kinda forgot it's a frigate instead of a corvette. The modded ship I was talking about is a corvette with no S dock. Thanks for the info.