Hi Adam no experience with brake shoes you show link to, but are you sure its shoes that are your problem ? It may well be that your brake drums need to be skimmed.Just finished restoration of 1969 ETS 250 and had my drums skimmed,i use EBC brake shoes and Venhill cable and brakes are very , very good, who needs a disc ? Brake drums can be distorted by over tensioning of spokes and rust spots can occur if bike standing for long periods of time . Drums can become glazed over time and these bikes are now 40 years old, its certainly worth considering because no brake shoes will work any good if that is the problem. Any decent machine shop should be able to do it. Hope this is of help. Keith.