Amazon.com: Molex to 3Pin/4Pin Fan Adapter, 12V PC Fan Adapter 4Pin Molex to 4 PWM Splitter Sleeved Braided Cable UIInosoo for 3 Pin or 4 Pin Computer PC Case Fan Power Supply
Adapter Molex / 3-pin 5V AK-CA-36
3 Pin Molex Female Housing with Pins – Coolerguys
Fan Molex Power Adapter Cable 3-Pin PWM Connector Converter PSU – GPUCONNECT.COM