I've actually got 8 pannier hooks. These fit perfectly on older Blackburn racks with 8.5 mm diameter tubing. They don't fit so well on my new Tubus rack with 10 mm tubing - they actually work but don't sit all the way onto the hook. I've also got some of the D-rings that I used to attach the bungy cords on the bottom of my panniers. Catriona, you can PM me with your address, and whether you want the D-rings also, and I send them along.