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Best solution
It's
pretty easy to manufacture your own Molex connectors & cables.
Try to find a store that supplies the pins and connectors e.g.:
http://www.frys.com/product/1651337?site=sr:SEARCH:MAIN...
Examine up-close one of the pins, and strip wires enough
to "crimp" the exposed wire section.
Then, there should be a second set of clamps
to crimp the insulated part of the wire.
Finally, insert each pin into the correct hole
in the Molex connector.
Proper Molex pins have "fan-out" fins that
compress while being inserted into the connector hole,
then expand to resist removal.
You'll need some extra yellow and black wire,
and you'll need to splice them with the corresponding
wires on one of your SATA power cables.
You don't really need to solder that splice,
but electrical tape is highly recommended;
otherwise, the splice will be exposed
and that is a NO-NO!
p.s. We've refurbished several older PCs,
and we usually discard the older PSUs:
we snip off the Molex connectors and wires
to have a supply of this stuff on hand --
for custom hot-wiring 
MRFS