
The encounter at the Meres Stadium is a repeat of the 2010 final which the Pilgrims won 1-0 courtesy of a Shaun Pearson goal.
The match on March 6 will kick-off at 7.45pm and will be decided by penalties if the scores are level after 90 minutes.
United progressed to the final following away victories in pre-season over Lincoln United (3-1) and Gainsborough Trinity (2-1).