I got 2 matching sets of John Bull brake holders with the rear side open off ebay. They came with rock hard, mismatched, unevenly worn original black John Bull pads and Fibrax. It's hard to find the Kool Stop John Bull replacement pads, but I found some on ebay. The John Bull holders are really designed for thinner steel calipers so the threads are on the short side, but there's enough engagement that it works. Black would have been better, but they're better than the integrated Kool Stops, the look of them, and they do stop nice.