Chewman,
Try doing a search on google (
http://google.com) and type in "1969 Pontiac Custom S". You'll find some sites that have pics of different Custom S'. I really didn't do much of a search beyond what I told you to do above.
Here's a link with a little more info:
http://www.cardomain.com/memberpage/356367/3 Scout around there; he has pics of the different Custom S' he owns.
Some of the sites have contact info so you can get in touch with the owners of the featured cars.
You can also do the same on other search engines, like altavista and lycos.
A friend of mine once owned a '69 Custom S convertible. He may still have it as far as I know. I've seen a few of these cars, but that's about all I know of these cars.
Good luck in your search for knowledge.
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Curiosity is good!