Stands 19 to 24 are the new stands that came into service in 2007. You can either get 6 ERJ/ATR etc size aircraft on, or 4 x 737/757 size or 2 767/A300 etc size in total.
Stands 2 and 3 can only take J32/J41/SA227 etc. The Eastern service to ABZ is now operated by an ABZ based aircraft. Gets the ABZ businessmen into LBA earlier.
Manx2 do sometimes use stands 2 and 3, but it is now very rare that both of these stands are occupied.
(Please correct me if I am wrong by the way).