Stepped flywheel - Ensure you seek a 60 pattern 58 holes 2 missing. Wonder if Volvo still has any in stock at some freakish price?
In case you haven't seen (my page) it has good detail:
http://people.physics.anu.edu.au/~amh110/Clutch/clutch_upgrade.htm
Have stepped with no holes available, but far from new. A friend gave his 88 240 manual to the wreckers with a good one, couldn't believe it when I found out!
If your thinking about having one drilled, this needs to be done using a proper milling machine with a rotary table and using another fly as a reference - as the orientation of the 2 missing holes (and start of new holes) is so crucial - it needs to be also at a perfect angle of xx degrees in relation to the flywheel mounting holes. A Volvo manual shows the relative alignment orientation.