Looking at who's definately gone through:
Guiseley
Altrincham
Gloucester
BPA
Bishop Stortford
Gloucester were due to play us,
Guiseley were due to play Halifax (who themselves face a replay). So defo rules them out as it's getting ratified Monday.
Altrincham were due to play Droylsden (who we've already played with the reverse on Sat 15th), an outside chance it could be this one.
The most likely is one of these two, BPA were due to play Gainsborough, we have a home fixture against them against them on Tuesday 6th so this would be a good one. Bishops Stortrrod were due to play Stalybridge, we have an away fixture on Tuesday 30th October.
I'd prefer the away fixture to be re-arranged myself.