First - insert standard disclaimer on search as well as blanket apology if I just didn't search well.

Ok - so when changing my oil recently - one of the screws bonding that skid plate/body armor has removed itself. There's now a little bit of vibration that I hear from down under and I'd like to replace it. Anyone ever done it? Thoughts/recommendations?

Should I check "the google" for a part number?
Thanks in advance... and take a beverage or two out of petty cash for your trouble...Z