Can you not just cut the sata cable, and add 2"-3" and solder it back up?
Will need to add some heatshrink to it, but would be cheaper.

Also, have a look at the top of the Koolance temp sensor, can you see the black dots around the inside, near the wires.
That is from silicon, the mortal enemy of paint.
It repels the paint when it is wet, stopping you from getting an even coverage.
Just get some solvent like mineral turpentine and wipe down the affected area.
As it is only primer, it will also remove the primer as well.

If you like the dots, don't bother, if they bug you, give it a go.