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BOLT HEX is Lookup Code 08120-6201E in the diagram.
This is one of 8 upper plenum bolts, doubles as a mounting point for the throttle cable cover. Bolt M8x1.25, Inner Threads M6x1.0 Nissan OEM Upper Plenum Bolt, Hex Head Long -...
Nissan OEM Throttle Cable Cover to Plenum Bolt - Nissan 300ZX 90-96 Z32.