OK . . . so how do I put a value on parts?

Converible only pieces like top latches will sell quick. I'd watch ebay to get an idea what people are willing to bid for them.
As for stuff like the K-H brake parts, you'll have to find someone who wants/likes those. I wouldn't give a nickle for all of them but that's just me.
Bottom line , ebay is the best market value feeler.
As said before, if you find someone who has seached for a rare conv. only piece for several years you can sure be their hero. LOL