I was thinking you meant the upper holes, which definitely attach via those push retainers I linked to. The bottom part uses some other sort of fastener which appears to be broken on mine. To remove the undertray however, there are just a bunch of bolts (quite a handful actually) and 9 of those same expandable retainers; 3 of them on each side and 3 in the center directly underneath the engine.
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2009 370z #206 (all mods are Home Depot)
2009 Ducati 848 (full Ohlins, Termignoni, etc)
2003 Grand Cherokee (long arms, big tires, 4.56, lockers)
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