If you look at the late style (99up) trans the bell housing is deeper, thinner and the starter is in a different position, whole different design.
The flywheel I had made was a copy of the 1.6...except the center which would bolt to the 2.0L crank but spaced to match the 1.6 position.....works great now (with a 1.6/16v clutch).
So for reference... the 2.0L flywheel that came on my engine (maybe others are different but hollander says they are the same) is slightly larger dia, thicker and spaced back farther from the block.
Is the 1.8 different?
Zag