Well considering the frame and cable is only $30 bucks, i’d consider getting it even if you only need the cable.
Before finding this mount/cable, I bought two other flat mount cables for $15-20 each, but they still protruded way too far out from the Kindle and were of crappy quality.
The one that comes with this kit is truly flat, high-quality, and works great. He will not sell the cable separately, I already asked. It’s what differentiates himself from his competition and I frankly don’t blame him.