Hello to Romania,
you can use the original flywheel from Wartburg, but you have to reconstruct this one.
You have to disassemble starter gear and assemble on the other side from flywheel.
After modify it looks like that:
Natural you can buy a complete part on different onlineshops.
The reason for that is, that you use the original Trabant starter on the gear side. It is also importantly that you take the starter from Trabant,
because the starter from Wartburg turns in the other direction.