Man, what a nightmare this turned out to be! In the process of reassembling the master after I powdercoated it, I accidentally nicked one of the seals. Nobody, but nobody would help me find the correct seal. I called the supplier of the master (that "W" company)and they would gladly sell me a new master for $280 but would not help me one iota in finding the proper seal. Heck, they wouldnt even return my 2 phone calls! I twice emailed the manufacturer of the seal, an Anjee Seal Co. in Taiwan,but got no response.I found a Lincoln master which looked like it had the same internals, but after purchasing one, found it was slightly different. I called a tech line for the manufacturer of this master and asked where they got their seals and was told it was "proprietary information" I then called 3 different brake rebuilders who advertised in Hemmings, but was told "we dont sell individual seals" My last call before giving up was to Apple Hydraulics in New York. He sensed my utter frustration and offered to help. I sent him some pics and a diagram of the seal. He found 2 seals closely resembling my specs and sent them to me at a very reasonable price. It is now back together and even works better than previously!!! Lazar, my hat is off to you! Thank you once again!