Here's something else to consider. I own a box set of Wayne's World 1 & 2: The Complete Epic, so I can try to get the two missing images of vehicles, plus one other used strictly as a decoration, which isn't currently listed.
http://www.imcdb.org/movie.php?id=108525

I don't own a copy of Matilda,
http://www.imcdb.org/movie.php?id=117008

but I can rent a copy and scan not only the images that are missing, but add at least two others.

I'd still like to find out if my local Blockbuster has a copy of A Thousand Clowns(1965), and if they don't, whether or not some other nearby branch of Blockbuster has one. If they do, I can scan a lot of images from that, but they'd only be background vehicles.