The Freemaker's base of operations, 'The Wheel', first appeared in Marvel Comics' Star Wars issue 18, in a story titled "The Empire Strikes!", first published in September 1978.
When Kordi and Zander run into Imperial Stormtroopers, Kordi tells them that her Imperial Inspector's "ID" is OU812. That is also the title of a Van Halen album with Sammy Hagar on vocals.