I'm hoping to find something like the originals, see pics. But if that's not possible then anything that will work will do.Look at a discobrakes, they have loads of styles
But they do seem to have less now.
https://www.discobrakes.com/index.php?s=0&Any idea of the style you are looking for?
Clarks seem to have more style of old still
https://www.clarkscyclesystems.com/product-range/brake-caliper-pads/mtb-hybrid.html