Cool - thanks a bunch. It's a PROTECTOR REAR FILLET - 78817-JL00B... whatever that is, sounds like I should throw over some hot coals for 2 minutes each side
On ebay it's listed as a Stone Guard, so there I have it. A stone guard in front of the rear wheels on a RWD car... anyways, I guess there's nothing behind it, so I'm glad I didn't just try pry it out. Cheers.