ISO: Black 1 1/8" threadless stem, 80mm, at 0 degrees rise or close to it. 31.8 clamp preferred, but I haven't bought the bars yet, so I'd consider smaller.

Have: Black Bontrager riser threadless stem in 80mm or black Kalloy stem at about 15 degrees in 100mm. Both 26.0 clamps, I believe. Plus other stuff.