I saw Star Wars about 25 times in the same theater first run, and the two previews for all of those viewings are burned into my memory: The World’s Greatest Lover and Damnation Alley, 100% those showed before SW in its initial run in at least one theater in '77-'78.
I have a very distinct memory of seeing a trailer for Lee Majors in “The Norseman”, but given that came out in Oct 1978, I may have seen it during the summer 78 re-release of Star Wars… of course I was 10 years old and I can’t recall what I had for dinner last night, so who knows.