It's been a while and I don't even have my stock undertray or bolts anymore, but IIRC the 4 rear-most bolts have plain heads (no phillips slots), and the rest all have phillips heads. There could be two others on the sides too, the furthest back ones on the sides.. it's fuzzy now. They all thread equivalently, so it's not a huge deal either way, but the phillips ones go to clips, whereas the non-phillips ones thread into metal.
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