I look for PCI-e risers that have exposed pads for power connection. Dealing with molex jr is pita and time consuming. Thanks for the responses.
Looks like you are going to hard-wire the power connector so you'll be doing a bit of soldering.
I had a connector melt on me so, with a pair of snips and a soldering iron, removed the damaged connector and soldered on wires with a SATA power connector at the other end - problem solved.
What you can do is exactly the same, if you can't find ones with exposed pad, buy risers with connectors and remove them.