Harris and Storey just missed out on the medals at the World Cup III regatta in Lucerne in July, finishing fourth in the men's double sculls final. The pair are the defending world champions having won in 2017.
Kerri Gowler has again been named in the coxless pair with regular partner Grace Prendergast under the watchful eye of coach Gary Hay.
Gowler and Prendergast took out the women's pair in Lucerne to retain the pair's unbeaten streak stretching back to last year.
Younger sister Jackie Gowler has a seat in the elite women's eight under coach Dan Kelly.
Jackie Gowler won gold with the women's eight in Lucerne, which was one better than the silver the team won at World Cup II.
O'Leary joins the men's eight for the world championships in Bulgaria. O'Leary and his Kiwi crew won the coxed four at the 2016 under-23 world rowing championships in Rotterdam.
In recent years since moving from Whanganui, he has represented the Waikato RPC.