I wonder if you all know about the KoolStop-made black pads made specifically to replace these SR/NR pads? I understand KoolStop is making almost everyone's pads these days (certain Shimano, Delta, Ritchey, Matthauser, & ?) and these pads look original (not orange!) until you squint and look closely at the labeling.. and they stop like the Matthausers... They are available through various sources ... Maybe Mike at Bicycle Classics has these?
Dale Brown
Greensboro, North Carolina