The 190d flywheel is single mass, your 2.6 has a dualmass. The transmissions input shaft is specific to single mass or dual mass, you can't mix and match. Also your 2.6 has 3 built in timing Windows which the 190d lacks. You would have to add the timing Windows to the single mass flywheel in order to make it work. I would save the money and use it toward replacing the syncros in your 5spd.
Single mass has long input shaft, dual mass is short.
http://www.superturbodiesel.com/std/attachment.php?aid=4456