I don't know the master cyl. date off hand. I have the OE one in the attic. I can look and get back. The replacement one is really nice. It has the same casting shapes on the sides and the bleeder screws. Most importantly, it works! The new FANTASTIC SD-455 valve cover sticker is safely stored away until the engine
is installed. Didn't want to take a chance bumping or scratching it. I also did replace the rear wheel cylinders. I was able to save and rebuild the front calipers. They were in pretty good shape.
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