There is a clip of the intro/promo bumper on youtube. Can ask the user if they're up for a trade.
Haven't had much luck with this process but you never know.
There's a preservation which pulls together a bunch of these television broadcast intros/bumpers into dedicated SW commercial breaks:
http://noneinc.com/SWUE/SWUE-FAQ.html
Good luck with your search, am also searching for old televised broadcasts.