Crown for my calibre 752 (166.0140)

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Hi all

I’ve recently picked up a vintage omega 166.0140 in gold plating. The crown that it came with isn’t original and I’m looking to replace it. Based on research I appears the correct part I’m looking for is 069SX42055. Unfortunately I’m not having as much luck figuring out the appropriate stem that goes with it. Depending on where I look I’m being told it’s either a 563-1106 or a 563-1160. The former is apparently 4.9mm tap 9 and the latter is 5mm tap 10.

Any advice or suggestions on how to find out which is the right one?

Thanks