Rally dash redo

Hi all, looking to redo our 67 dash harness. Gathering up supplies and wondering what the female connectors are called on round connector?(see pic)
Also, can I sub in 14 gauge wire where the factory had 16 gauge? Would it be too "bulky/awkward " ? Connectors would be same size?( When new ones are listed the description is usually 14/16 gauge, so I assume they are same size?)
Thanks
Steve

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