Chesterfield made a double substitution on 72 minutes with defender Payne on for Hitzlsperger and wide man Williams taking the place of D'Auria. Abdou Sall who had a cracking game in defence for Harriers.
Two minutes later a long Stamps ball nearly caught out the home side with Breckin just stabbing the ball past his own post under pressure from Broughton.
Broughton went up well to head at keeper Abbey on 77 minutes after Larkin's quick break and cross from a clever Hinton through-ball.
Chesterfield's Moore missed a tremendous chance on 81 minutes when he guided a superb cross from Williams wide from 10 yards with just Brock to beat.
The striker came off five minutes from time to be replaced by ex-Wolves youngster Mark Jones.
Sall was having a cracking game for Harriers, winning everything in the air and using the ball wisely too.
The match ended goalless at 90 minutes and the teams went into extra time when the first goal would win the tie.
If the game remained goalless, a penalty shoot-out would decide the winners.
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