Diarra’s late equaliser made it 1-1 and took the game to penalties – and keeper Metcalfe made two saves in the penalty shootout to give Adam Murray’s men a 4-2 win.
They now take their place in Monday’s third round draw – alongside fellow Sussex sides Worthing and Horsham – in the last 64 of a competition that ends in a Wembley final.
See pictures by Lydia and Nick Redman from a dramatic afternoon at Meadowbank on this page and the ones linked and get the Borough latest in the Eastbourne Herald every Friday.
33. Lydia Redman
Dorking Wanderers v Eastbourne Borough, FA Trophy Photo: Lydia Redman : Lydia and Nick Redman
34. Dorking Wanderers v Eastbourne Borough in the FA Trophy pictures by Lydia and Nick Redman (10).jpg
Dorking Wanderers v Eastbourne Borough, FA Trophy Photo: Nick Redman : Lydia and Nick Redman
35. Lydia Redman
Dorking Wanderers v Eastbourne Borough, FA Trophy Photo: Lydia Redman : Lydia and Nick Redman
36. Dorking Wanderers v Eastbourne Borough in the FA Trophy pictures by Lydia and Nick Redman (19).jpg
Dorking Wanderers v Eastbourne Borough, FA Trophy Photo: Lydia and Nick Redman