fatcat,

Here's where you can get most of the parts, when they have them in stock:

http://www.wallbike.com/catalog/sadd...saddle-parts-0

Unfortunately they're out of stock of quite a few items.

I too am in the market for saddle frames and parts as you describe, since I've been teaching myself to put new leather on them. A few friends have contributed frames for me to work on, I traded for one from another forum member, I bought another one at a swap meet, and I have a lead on a couple more. Some people, when something is broken, throw it away; others put it in a box. We just need to make contact with the latter....

Good luck!