My educated guess would say your not going to find a flywheel from another Merc that will mesh properly. I would suggest looking into having a custom flywheel fabricated from stock parts.
Check out this guy; http://www.jbracing.com/flywheel-porscheul1.php
It looks like they could definately come up with a solution. I have never personally delt with these guys but thier work looks good.
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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine 
06 GT i-Drive7 1.0 Mountain Bike (with GPS!  )
PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320
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