Salisbury or Dover, and one of Brackley or Halifax will earn promotion to the Conference after today's results.
Salisbury beat Chelmsford 2-0 to take the tie 2-1 on aggregate, while Dover surrendered their 3-1 first leg lead to force Eastleigh out of the tie on penalties after a 2-0 loss in normal time.
In the North Halifax won 2-0 at Guiseley to take the tie 3-1, and Jon Brady's Brackley beat Altrincham 3-0 to overturn Alty's 2-1 first leg lead.
Both play-off finals are next Sunday.
Meanwhile, Spennymoor Town beat Tunbridge Wells 2-1 at Wembley in the FA Vase final. The tie was watched by 16,751 who paid £15 for Adult tickets and £5 for kids. Tomorrow's Conference play-off final is expected to have a similar attendance, with Adult tickets from £36 and kids £18.