A stunning double save from Cameron Belford and a long range strike from Ryan Wallace rescued a point for the 10-man Blues at Bayview.
Second half goals from Kyle Turner and debutant Angus Beith crowned a memorable comeback win for Stranraer at Gayfield.
Stuart Wild's U20s side continued their impressive form with another two victories this past week.
Highland League side Brora stunned Stranraer with a late winner at Stair Park to advance to the 4th round.
Stranraer U20s returned to winning ways with a sensational 11-2 victory over Clyde at New Tinto Park in SPFL Development League West.
Ryan Conroy dealt Stranraer a double blow as the Blues suffered a disappointing defeat away to Airdrie.