It's box office viewing in E10 on Tuesday night, as league leaders Cambridge United head to the Breyer Group Stadium.
The O’s will welcome The Lillywhites to The Breyer Group Stadium for the first leg on Saturday March 16 before travelling to New Bucks Head Saturday March 23.
The National League fixtures against Bromley and Eastleigh that were originally scheduled for those dates will be rearranged. Details will be confirmed in due course.