Proper Springbar Size and Guage?

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So I was able to purchase a 18mm deployant clasp and a 20mm/18mm band for my new AT.

I now need to purchase a quality Springbar for the deployant. Do I need a 1.5 or 1.8? And do I need to purchase a 17mm instead of an 18mm as some posters mentioned for newer Omega's. Found Seiko branded springbars on eBay. Would that suffice?

Thank you in advance.