MCFK Stem. This is a 260 degree mount, must be slid on from the side (makes the clamp stiffer and more secure). If you're not sure if your bars will work, ask. The weight is only 89g, retail is over $300 (google it and see for yourself).
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This one has been laying around for about a year, I had to go with a shorter stem, I did remove the mcfk decals on the side of the stem as they didn't match my frame.