Yes, I found one on Ebay. It says no longer available. This is my maintenance vehicle for work. I can't take it out of service long enough to send the master cylinder off. I hate buying another one when the rebuild is so easy.
The 70643G02 works fine. The only difference is the push rod. It attaches differently. The old has a Y (yoke/ wishbone) with a pin. The end of the new one is threaded. The length is the same and the travel distance is the same, so I just used the old push rod. No mods to be done. All is well. Now it has a fuel leak. Its coming out of the little vacuum lines below the carb. I'm checking it now. Come on old horse!