i see 12 3 stamped into the body there so maybe this?
[URL]https://www.floridatorqueconverters.com/Chrysler-Dodge-Torque-Converter-12-3.html[/URL]
the CY9-8-SP could be anything. i'd assume 9 for 904 and SP for special? but that's just WAG
anyway, more important is that the snout of the converter matches the crank register of the 273