Unfortunately those numbers mean nothing to me, but they probably mean something to whoever built the converter. Perhaps others might be able to help you. I know that I can't say I've ever seen them on a factory core. The converter looks like a nicely done piece, and one would think that they should/could have put their name on it. While the transmission is out, have a look at the pump bushing. The hub looks looks ok, with a little wear(?) on it. But run your finger nail up and down a couple of times to make sure it's smooth. A converter hub should be a smooth as a crank journal. Sometimes, converter builders will have a specific color to paint their converters with to make them stand out from the crowd(marketing 101 :lol: ) but black is a very common color. Just for giggles, drain the oil in the converter out, and see if there are any type of foreign materials in it, and if there is, get it taken apart for a good cleaning, and if it has thrust bearings in it, get them replaced. Again, wish I could help you more,