There is no harness that we sell for a D10 EFIS. The D10A harness could be adapted pretty easily, especially if you aren't using the D10 as your altitude encoder.
You could call SteinAir and get a D10 EFIS harness. He used to make them, and he makes our current D10A harnesses.
Upgrades from a D10 to a D10A are $350, plus another $50 if you have a remote compass.