Genuine Apple MMEL2AM/A Thunderbolt 3 USB-C To Thunderbolt 2 Adapter A1790 (NEW) 888462859158 | eBay
StarTech.com TBT3TBTADAP Thunderbolt 3 to Thunderbolt 2 Adapter - Backward Compatible - USB C to Mini DisplayPort - USB-C to Thunderbolt 2 - Newegg.com