I tried to fit the Conti GP5000 TL on my Mavic Cosmic Elite wheels. One tire I could get on with maximum effort and swearing, the other was impossible. +1 on jadocs recommendation on the DT Swiss tape. It's good quality, cheaper and easier to get than the Mavic tape. The roll of Mavic I bought did not have enough tape on the roll to do both wheels, and I followed their recommendations.
I'm not happy with my Mavic wheels. It's pretty much proprietary; valve stems, tires, and tape (DT Swiss seems to be the only brand that has that width). Getting replacement parts is troublesome, even on their website.