You can't go wrong with the official aerobar of Ironman;, the Profile Design™ T1+ Viper Carbon Aerobar.
Official aerobar of Ironman.
Carbon fiber extensions for lightweight, sturdy construction.
6061-T6 Aluminum extensions and forged brackets with length, width, and rotational adjustment.
F-22 adjustable anatomic armrests.
Clamp fits 26mm and 31.8mm bars.