Boult picked up a thigh injury in the drawn first Test.
The three-match series now stands at 0-0 with the second Test set to begin from March 16 at the Basin Reserve in Wellington.
With the first Test a stalemate, Wellington is effectively the start of a two-Test series which du Plessis said heightened the need to get a result.
Neil Broom comes in at No 4 for the Black Caps in place of the injured Ross Taylor for the match in Wellington.
Oil prices recover marginally after plummeting to three-month low
Traders should use the current fall in crude to accumulate long position in oil if prices rebound from the trendline. Subdued refinery activity as operators perform seasonal maintenance in the USA could also put a lid on any rallies.
Broom has already faced the Proteas this summer, managing scores of just two, two and zero in last month's one-day global series - a recent record which underlies du Plessis' confidence in his bowling attack.
"Obviously we couldn't get rid of Kane in the first Test and they were successful as a unit".
South Africa, on their part, may opt to play the same set of players at Basin Reserve. "There lies the secret".
"That'll be big for them", du Plessis.
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There's also been an increase in the number of centrist office holders of the type that Schwarzenegger has praised, he added. "[Schwarzenegger is] someone who could play a huge role if Republicans wanted any hope of having relevance in California ".
"It's a tough job, especially from a seamers' perspective", said du Plessis, who added with a laugh that the team's spinner might find himself bowling a lot of overs into the wind. KG (Kagiso Rabada), I certainly feel I can use him.
South African captain Faf du Plessis, however, could barely contain his excitement at the state of the wicket and New Zealand's injury woes.
"Someone like Vernon doesn't necessarily have to bowl quick all the time". He had also stated that he was happy over the way he was being treated by Cricket South Africa (CSA), contrary to what his agent, Francois Brink, had said. "All three will be prepared to do the hard work".
Miami to host El Clasico fixture later this year
And Sports Illustrated report that the deal has been agreed and will be announced in the coming hours. Arguably the world's greatest club soccer rivalry is headed to American soil for one night only.