The one on the left is definitely OEM installed on all Nismo 370s. It's manufactured by Yamaha and then installed by Nissan. My z is actually apart right now so I took some pics of where is it supposed to be installed. My Z is a Touring Edition, so it didn't come with the damper. I picked it up used. I'm not able to install it right now because of my aftermarket oil cooler. I have to relocate it so the damper will mount properly. 
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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