With a merger in 1971, Wairarapa-Bush maintained the June holiday-weekend rivalry, featuring in the Bay's 1984 centennial celebrations. The Magpies' last match against Wairarapa-Bush was a Queen's Birthday match in 2003, won by Hawke's Bay 37-15 in Napier.
The last match against Mid-Canterbury was a second division competition match later that year, the Magpies winning 99-8 at McLean Park three weeks before being hammered 66-12 by Northland in the final. The Magpies haven't played Horowhenua since a 67-22 Division 2 win in Levin in 1994.
In an indication Hawke's Bay would have liked to capitalise more on the nostalgia, Mr Bishop said: "In an ideal world, we would have played the Wairarapa-Bush game around Queen's Birthday weekend."
The defences offer Hawke's Bay club players the chance of Ranfurly Shield exposure, but with Super 15 playoffs scheduled to start on July 3, the Bay's record 16 fully-professional players are expected to become available in increasing numbers as their teams are eliminated and they return to Hawke's Bay.
Mr Bishop said: "We know that each of the Heartland opposition will be difficult opponents."
The full programme, including proposed defences against ITM Cup sides, is not expected to be known until the release of the competition draw in January-February.
Hawke's Bay won the shield in a challenge against Counties Manukau on August 30, and staved-off four challengers at McLean Park for the rest of the season, culminating in a shield-saving a 20-20 draw against Southland on October 1.