Genuine 'New Old Stock' Norton U brake clips (I believe they are ex WD 16H - so would be same as 30's/40's cammy ones).
These are unplated and came a bit rusty, but I have cleaned them on a rotary wire brush and sprayed in water repellent oil. They do not look much different to the modern variety - but at least you know these are genuine! (I think you could go get away with just painting these with a coat of dull silver paint).
Only last few left, then sometime in the future I will need to replicate by lasercutting/pressing