If the fluff text were to be believed (hint: don’t), then the answer is the Annaconda can carry a Sidewinder. There happens to be a large door or hatch on the front of the ‘belly’ that looks about right for a small craft bay.
According to the original description of the anaconda, about the size of an anaconda.
It used to say that it could launch sidewinder(s?) from it. (Does it still say this?)
The Anaconda can also be upgraded with a docking bay allowing small fighters up to Sidewinder-size to be carried and launched, however most are only capable of supporting short-range fighters.