The switch is a 3 Terminal SPST 2 Position Rocker Switch: https://www.amazon.com/gp/product/B071KTQ2F5/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
The wire splicers came from my tool box in the basement, no doubt left over from a brief car audio hobby back in the day. You could use any wire...