Albion have been allocated 3,100 seats for the LDV Vans Trophy tie at Queens Park Rangers on December 7.
They can be bought in advance from the ticket office in Queen's Road, Brighton, or supporters can pay on the day.
Seats are priced at £10 for adults and £5 concessions.
The quarter-final southern section clash (KO 1pm) could not be played the day before as Fulham, who share Loftus Road with Rangers, have a Premiership fixture against Bolton.
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