That's the same kit MikesXS sells. I think it used to sold as the Heiden Dyno Tune kit because it was supposedly developed by Heiden in Europe. That seemed to present some problems when trying to use it in this country. Many reported it didn't work very well. Compare the length of those new needles to your originals. I think they were quite a bit longer which would make them leaner, and that means they may only work with quite larger mains (in the mid 140s). But, I don't know, maybe the kit needles are different now. Do compare the lengths though. A replacement needle usually needs to be pretty close to the same length as the original to work.