Hi, looking for a little help. I'm looking to buy some extra spring bars for my NY0040. I know they are 20mm and I'll need them to have shoulders. My question is what is the proper diameter for them to fit through the OEM bracelet end links, and the diameter for the ends. I'm guessing 1.5mm and .9, but that's just a guess. Does anyone know for sure so I get a secure fit?