Repaired the front belly pan and brake ducts.  Hit a curb and broke the front belly pan and some of the plastic rivets that hold on the brake duct.  Ended up with a "passable" repair and saved $330 for a new belly pan (which I would also probably break) so thought I'd pass along some pictures and tips.  Replacement rivets are PN6500911 - 1/4 in black nylon (pictured) and I got 50 on ebay for $10.50.  You will need a special riveter.  The usual pop-rivet ones won't work.  You can get a plastic riveter from Harbor Freight (pictured) for about $18.00.  I also needed a plastic welder (pictured) that also came from Harbor Freight for about $20.00.  The riveting is easy and the repair was quick.  The plastic had bent in some places and you could see white stress lines.  A heat-gun warmed the plastic and bending it back into shape made these marks disappear.  Welding the crack closed was a little more challenging.  What worked best for me (after trial and error) was to apply some plastic, let it cool and add a bit more until the crack was filled.  That in a nutshell is how I am spending my corona lock down (so glad I'm not in Michigan!).