If you be patient with eBay you will find a good deal eventually. My rear master cylinder works well with the same old seals and after I manually 'honed' the bore with 1600 and 2000 grid. It's not perfect, but works. IN the meantime, I tracked another one on eBay. I am going to rebuild it and probably swap with the one I have. The whole assembly: rear brake caliper, line, the master cylinder bracket with the whole cylinder assembly complete, including a usable dust boot, cost me US$ 15 (fifteen). So, they are out there if you have time to wait for it. Lots of sells in the USA offer free shipping as well to a US address.