I use KS Dura inserts in Mine. Kool Stop International - High Performance Bicycle Brake Pads Since 1977
the Dura 2 would work too..

example Kool Stop Dura2 Brake Pad Inserts - Black and Salmon

i think they went to Tektro for the Brake manufacturing source..

my older Mk2, CLB made them for the company at that time.

I put KS Continental pads on , they worked too stud is molded in the pad & a Nut holds it on..,