east sider wrote:2005: New Rockford-Sheyenne and Four Winds or Cando?
70s: best guess would have to be Hillsboro and Mayville.
You are on the right track with Hillsboro and Mayville, although they did not play against each other either of those years:
1977: (1) Hillsboro beat (2) Devils Lake St. Mary's 61-52 in the Region 2 semifinals
1978: (1) Larimore beat (2) Mayville-Portland 40-38 in the Region 2 semifinals