I started work on the Buddy Seat article, by going through The Legend Begins (TLB) to see what came stock, and what was optional - on a new bike. TLB is a great source of information (and you can order it from your local Harley dealer). It's not perfect, but it's the best single reference we've got.
The nascent article is here http://www.harleykmodel.com/technical/seats-buddy/index.html. Comments please! There's tons of more work to do. Lots of photos to incorporate. I found a 1965 Buddy seat in my stash, and I'll have to clean it up and photograph it. And the 1966-later ones mystify me right now, I'll have to cogitate on them some more.
1) Jerry R. - could you send me scans of the buddy seat pages from your 1967 parts catalog?
2) Dave C. - You da man on the 60's models. Any words of wisdom? Especially 1966 and later?
3) Does anyone ANYONE have a 1969 or 1971 Parts Catalog ??? I'd desperately love scans of the buddy seat pages.