Word of warning about the ICH stem as used by Arc8.
Bought one for my VB-099 build. They're unusable with aero bars, despite no warning about that. You might think the clamps are split and can be widened, but they're a contiguous oval(ish). You can't slide them over the flattened section of either the aero bar I'd bought, or any that the LBS had in stock. Round (and not oversized sections) bars only.
Awful design. Supposed to give you a choice of whatever bar you want. But only if it's slim and round