I've got a couple of pairs.
1. Without hoods & also missing bar clamp bolt (clamp is present). Blades are scratched but look OK
2. With hoods, cosmetically & functionally perfect
PM me if interested.
Here's a stock pic I found to illustrate to others. As you know, the idea is to provide a varied range of pull rates rather than the single static or the dual rates provided by the version with the reversable tab. I understand they were designed to be paired with Delta calipers but are actually a useful adjustment addition for all calipers. Reasonably rare and tend to attract a premium.