Evl370,
You can stack the sandwich plates without any problems whatsoever. You are correct, the VQ35DE/VQ35HR engines in the older generation 350Z have a similar sandwich plate adapter present from the factory.
This is a factory attempt of using engine coolant to help pull heat from the engine oil, similar to a Laminova style oil cooler that is becoming more popular on track cars(but at a fraction of the cost).
By stacking the sandwich plates, you should not have any problems with line routing, clocking of the sandwich plate or changing the oil. It will extend the filter out an additional 1.25" or so, but nothing major.
I am actually putting the finishing touches on our 350Z/G35 oil cooler kit which retains this cooler.
Only the Middle Eastern and Austrailian market 370Z's came equipped with this setup. I would be very interested in seeing some pictures of our kit installed on your car.
Good luck with the install!
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