Genuine Apple Thunderbolt 3 USB-C to Thunderbolt 2 USB Cable Adapter MMEL2AMA 888462859158 | eBay
Amazon.com: Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter : Electronics
Amazon.com: QCEs Unidirectional USB C to Mini DisplayPort Cable, Support Only Mini DP Monitor(Not Thunderbolt 2 Display) 4K Video Output Cord 6.6Ft Compatible with USB-C MacBook Pro Mac Mini iMac to Mini