I'm putting together a M104.980(300E-24 with CIS), and the flywheel is the two-piece type

I'm using a manual 5spd Getrag from a 300E-24, which seems to be the same gearbox as in the 190E 2.6 Sportline...

I want a lighter flywheel, and there are some serious problems ahead if I should try to lighten this flywheel...

But...

I seem to recall that the 190E 2.6 Sportline has a one-piece flywheel with the larger diameter...

If so, would the flywheel from a 190E 2.6 with manual gearbox fit, is it the same diameter(larger,240 mm) as the two piece 300E-24 flywheel?

Has anyone here lightened a flywheel like that, and how much did you lighten it?