Good Idea. I wonder if the pins are bigger then the ones on mine? I did get mine in but not a real big deal. Just that the wires were so close together it took some doing.I couldn't get the Safe-N-Sound Stealth cord pins to work as-is either. No way since they are far too large for the tight pin openings in the back of the plug. But as the USMC say: Adapt, Improvise, Overcome. I was just about to make up my own cord with smaller pins, when I decided it would be easier to grind down and shorten the Safe-N-Sound ones. I used a Dremel with an aluminum oxide stone wheel to reduce the pin diameter about 50% with even more taper toward the tip. I also cut them shorter to about 3/8". All good now, though it was a frustrating waste of time until I ground down the pins. Once I did that, no problem.
Sorry I didn't take a photo of the modified pins, but here is the end result.
BTW The positive wire is yellow and pink, and the mirror is powered in Accessory mode, so it's easy enough to test.