You're spot on that we didn't fill it every home game in 1998/99 but I think Maine Road's capacity was quite a bit less than 34,000 back then. IIRC our biggest home crowd was around 32,500 against York City (without checking 32,471 sticks in my head!) in the last league game which was more than the first game against Blackpool and even the Wigan play-off home leg (probably due to segregation reasons). We got up to 34,000-ish capacity over the next couple of seasons when they started to add in seats in weird places and built a second Gene Kelly between the Kippax and Umbro/Platt Lane