It says pair of extentions..... so I would venture to guess it should be a pair. Take a picture of the ad for your own evidence just in case you have to take it further than the seller.
I second this... I wouldnt however put the toilet in and finish the inspection because in my eyes the toilet would have to come back out in order to redo. I would put the county on hold and get this guy to redo the job all at his cost.
SSATHRE,
Looks great! Very close to my current plans. I was curious to see (if you dont mind my asking) if you would tell me how much it cost with concrete pour and everything?