Andreeww
100+ Head-Fier
Oh sorry, I misunderstood you. You're looking to make your own cable? I tried to look for some mono plugs that were thin/narrow at my local stores (Radio Shack and Fry's) and could not find anything that was like that. You may be able to use stereo ones though as long as you hook it up right.
The Denon AH-D7100 cable I got on amazon works well. I use it daily. https://www.amazon.com/gp/product/B00KX5P06G/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
Here's photos I posted earlier on this thread: http://www.head-fi.org/t/793518/audeze-sine-series/2310#post_12796535
What's the diameter of the connectors of the cable you got on Amazon? Is there any room surrounding the connectors when they are plugged in? Or do they just just fit in with no extra space left?