This would be the piece which sits under and behind the bumper. Has anyone replaced these? Tips? What brand aftermarket pieces have you tried?

 

There's not much to it. It's a bunch of clips, removed with flat head screwdriver and fingers, and a few 10 mm head bolts/screws.
I always send to Certifit for their good pricing. Otherwise, it's piece of plastic underneath the car that no one can see, so in my case, price is final decision maker. Junkyards may also have them.

 

you can actually get it on eBay / Amazon. i had a problem with mine figured this out. the front part directly behind below the bumper is needed, it comes off with clips and bolts as just previously stated. the second part directly below the the oil filter and transmission, its not really needed its just extra protection from salt, water whatever. i cut around half of it off and just bolted a piece of it back on to help hold the front part on all together and every things fine.

 

Junkyard?
Has to be lots of these finally dying off nowadays.

 

262,500 miles on mine and runs like a champ (because I've owned since new and service regularly)...and with aftermarket certified offerings at under $40, why buy used wherein you will spend $20 or $25 used PLUS 30 minutes taking the darn thing off the car first?

 

These do not take 30 minutes to remove, and new replacement ones aren't 40 bucks.

 

R we talking the same part? These are under $40

See: REPL310111

 

Here it is

 

Yes thats it.

 

That looks like only the very front part of it.
That's not the whole thing at all.
I was just offering the suggestion to help.
We used to do that on this site rather than all the price matching and babbling that goes on nowadays. If you've had your rx for over 250k miles it should be obvious that part you're looking at is only the very front plastic and not the full engine guard, which is what I thought we were talking about.

 

seriously?