I'm on the hunt for a crown as well so I'm sharing my research. Based on the Omega charts I've found, ref 14381 uses the 42055 crown which is the decagonal crown used in a lot of Constellations including my 168.005. Per Desmond's blog, other references for that crown are #4204, 42004, or BestFit BF 8100/1080.
https://omega-constellation-collect...omega-constellation-crowning-glories.html?m=1
Unfortunately, decagonal crowns are no longer produced so people are using the alternatives. The alternative for my 168.005 14k gold is BF 8100/1664Y. However, ofrei says the alternative replacement crown for 14381 per BestFit is BF 8100/1134 (upper middle of ofrei's page).
https://www.ofrei.com/page_147.html#10406
Obviously, everyone is searching for the decagonal crown because it's the original. If anyone knows of one that's available for sale, please let me know. I have a WTB post up as well.