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For the two piece unit, looks like the first half is pressed on and the second gets bolted to thatI am not sure. It might just be drilled for the custom reluctor on the back. I was looking at the fluidamper standard unit and it looks like a normal 1 piece unit.
NEW - Fluidampr Performance Diesel Dampers For Duramax L5P
Fluidampr releases two new Performance Diesel crankshaft dampers for the GM / Chevy Duramax L5P engine. Official press release and product details.fluidampr.com