Does anyone know where i can buy an under engine cover?

 

The plastic protective panels underneath? Either at junk yard or at Lexus. Doubt someone would make non OEM for that.

 

I replaced mine recently since I am a stickler for detail and my original had scratches on it from the PO. I went ahead and purchased mine from the dealer. Got a little discount on it, but still paid around $150 for it.

I have my original one if yours is so bad off you would consider a used one.
Actually, most folks would consider the original one to be in very good shape.

 

That's what I call a stickler alright... under the car too. So what happens when you scratch it the first time? You'll change it again? If so, I'll take your seconds one as mine is pretty scratched up...

 

If I do it, it is different

I don't plan on scraping it. If it does scrape, that means my bumper was scraped as well, and that would be even more of a bummer. I know, it is bound to happen, but I can wish can't I?

BTW, when I first purchased the car, I immediately replaced the four rubber undercarriage deflectors (not sure what they are called) that are at all four corners next to the wheel wells.

 

Ah, those two... what the heck are they for? Can't be mini-mud flaps because they surely don't deflect anything.

 

Rear set is labeled Rocker Protector
The front set labeled Front Wheel Pad

 

Here are the pix of the engine cover plate. This is the piece that you are talking about right?