I think most of those yellow pieces came from here: (URL) think they did make them in yellow in other sets, as well. I will see... Scott Sanburn (...) (26 years ago, 28-May-99, to lugnet.general)
(...) inventory for this set - it's a nice set for parts when I got a horde for $9.99 ea at KB Toys). (...) (26 years ago, 28-May-99, to lugnet.general)