Kevlar 29 is ballistics graded Kevlar. To my knowledge, this is unavailable to the public. Kevlar 49 is what you would probably be getting. I just put Dons coated kevlar cable ina Sukhoi, it is very nice, I will use it on my next plane.

For your 120 U/S, You will have no problems with using the readily available Kevlar cord, as long as you take a few extra minutes to make sure nothing is scraping the cable. Its very simple. Good Luck