these Kool Stop pads (and holders) are excellent and have the "orbital" mounting washers that as Masi says above, allow very free adjustment of angle, toe, etc.
https://www.ebay.com/itm/KS-CXT-Kool...-/401914890076
this is an excellent part and I have them on several bikes.
Mark Petry
Bainbridge Island, WA USA