198.029 crown help

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Not sure if the stem is tap 9 or tap 10. Also not sure about tube size, etc. The parts manuals for the movements don’t include the crown because they’re used in many different cases. Looks like crown searches are the ultimate rabbit hole.
 
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Crowns are listed in the case parts that you can find here for your case reference.

According to the above, the right crown is listed as 069ST43242 on Cousinsuk. The one you posted is different. There may be another crown that Omega lists as the replacement today, but that information is only available to Omega authorized watchmakers. You can search ebay for "Omega 43242 crown".

 
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069ST43242 is the correct part for a stainless case.