Gliders and end fittings for plastic curtain rails plus some rail mounts - fit Harrison and probably others. Most of the gliders are 30mm inside height (should fit rails up to 28mm height) but there are some which are only 28mm internal height.
Also, spare Wickes Metal curtain rail mounts.
Finàlly, curtain hangers - not sure what these fit, but maybe you know?
If you can make use of any or all of these let me know.