I recently received this bit of information from PNW Avant on how many you should have of each. I'm passing it along to you as well.
"The 3 12mm should go in the front. These should have rubber washers that fit between the bumper surface and the fastener head. The belly pan should sandwich between the bumper and the chassis. you should have 5 of the 18 mm. Three of them go only the front edge of the belly pan, directly into the chassis. The two other 18mm go over on the sides near the wheel wells. The last 3 20mm go on the back edge. The washers for these should go on the belly pan side, after pushing the fastener through (the washer is meant to hold these fasteners in place, attached to the belly pan, at all times. Meaning, you loosen them, but they should stay with the pan due to the washer. Probably to help you not lose them."
Part numbers:
12mm - ?
18mm - 8D0 805 121
20mm 8D0 805 121B
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