Amazon.com: GINTOOYUN IDE 40-Pin Male to Male Hard Drive Adapter,3.5 Inch Desktop PC PATA Port Card for 3.5 Inch IDE Interface Hard Drive : Electronics
40-pin FPC to Straight 2x20 IDC Female Socket Header : ID 4905 : $3.50 : Adafruit Industries, Unique & fun DIY electronics and kits
uxcell a14112600ux0306 2.54mm 220 40-Pin PCB Box Header IDC Socket Male Connector (Pack of 17): Amazon.com: Industrial & Scientific