Baobab Archiver might know more details? He’s working on a Knight Rider music restoration.
https://originaltrilogy.com/topic/Knight-Rider-restoration/id/55803

I was such an avid KN watcher back then, I can’t believe I never spotted that! At least the prop guy took time to customize it a bit. And cover up the manufacturer/copyright information, even though that would have been hard to see on analog tv back then. Coincidentally, Kenner had the KN toyline.

I saw a KITT replica parked at a commuter train station out here once. Even had the California Knight license plate!

Now I have a dusty memory of some other Kenner SW weapons being dressed up and used as props, but can’t recall where or when.