The ship packages (the equipment you get upon purchase) are located in goods.ini
There is, for example, an entry for "dsy_insurgent_hull" - which defines the basic price of the mere ship and also tells the game which ship you are actually buying;
and an entry for "dsy_insurgent_package" - which first references back to the hull (so it knows which ship) and has entry for every piece of equipment the ship comes with and in which slots those are, this includes contrails and lights. Note that upon purchase the price for the equipment is added to the basic price of the hull.
