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A capacity crowd of 3,000 is expected as Maidstone look to finish the job and reach the National League South play-off final.
Stones lead Truro City 2-0 going into the second leg at the Gallagher on Sunday (4pm) and the race is on to snap up the remaining tickets.
Manager Jay Saunders has warned nothing is settled yet and has called on fans to help his team over the line.
About 200 supporters made the 300-mile midweek trip to Cornwall for the first leg and, along with the home crowd, Saunders wants to reward their backing.
He said: “Come along, make plenty of noise and get behind the boys. Please don’t think it’s done and dusted.
“The crowd make such a difference and in Truro they were outstanding. To come that far on a Wednesday night, the boys and myself appreciate it and hopefully they can come Sunday and get us over that line. It would be lovely to get them into the final. They deserve it, and we’re within touching distance.”
General sales continue until 7pm on Friday, with any remaining tickets expected to be gone by midday Saturday.
Away goals don’t count in the play-offs, so any two-goal win for Truro would take the tie to extra-time and possibly penalties.
Saunders said: “At four or five up you’re pretty much there but, at 2-0, an early goal for them and everything changes.
“They’ve got to have a go and sometimes they’re the hardest teams to play against."