The 1-640454-5: The 0.100" pitch has to match the ribbon conductor spacing; if it doesn't, the IDC contacts bite between conductors instead of onto them. Watch pin-one every press.
Single-wall shrouding and pin-one orientation
This gives you a clear visual on pin-one orientation during assembly, but the exposed side means the header relies on the receptacle's strain relief to keep the cable from peeling off the pins.
