Former Act president Catherine Isaac has been confirmed as No 2 on the party list.
Act will hope Ms Isaac, formerly known as Catherine Judd, will bring some much-needed credibility and stability to a party plagued by controversy and caucus in-fighting.
It is also weathering the fallout over the differences in opinion between leader Don Brash and Epsom candidate John Banks about decriminalising cannabis, and a poll on Sunday showing Mr Banks trailing National's Epsom candidate, Paul Goldsmith, by 14 percentage points.
A different poll last week indicated that support for Mr Banks would fall if National looked likely to win a majority of the party vote - enough to govern alone.
If Act fails to gain 5 per cent of the party vote, it will need Mr Banks to win in Epsom to return to Parliament.