Hey Bruce, I hate to be a negative nelly but I had just tried the side glow fiber optic on my X1 build, and I was very disappointed with the stuff. It barely produces a glow. In fact, in my opinion, it is marginally better than the regular stuff.
I tell ya what though. If you have not ordered any yet, I can send you a sample via snail mail to keep, no charge. You can play around with it and see how it works for you. If interested, shoot me a PM with your mailing address. I’ll be happy to send you some. I might even have the size you want.