76884-AA135, looks like Nissan's EPC calls it a rear pillar inner insulator: https://www.amayama.com/en/genuine-catalogs/epc/nissan-japan/skyline/bnr34/6628-rb26dett/body/767?frame_no=BNR34-000000
Not wrong, but if I expected to not drive the car for a while but do a fair amount of garage shuffling I wouldn't run E85. Flashing a tune every time that happens sounds like a headache compared to a single map + flex fuel sensor.
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