For people who don't know what a dual mass flywheel is (myself included)
This is copied from a website, may not be exactly like the Transit one, I don't know
The dual-mass flywheel is designed to absorb engine vibrations before they are transmitted to the driveline where they can create gear rattle. This is achieved by splitting the conventional flywheel into two sections: a primary section, which bolts to the crankshaft, and a secondary section, onto which the clutch is bolted.
The primary section of the flywheel contains springs to isolate engine vibrations and a torque-limiting device to prevent engine torque spikes from exceeding engine and transmission component strength. When torque spikes occur, the torque-limiting package allows the primary section of the flywheel to turn independently from the secondary section, saving the driveline and transmission from damage.

Even if you don't need it, grab it.
The minute you do need it, it'll be gone.