Headlight Bulb Metal Clip Broken
 

Anyone know the part to replace the metal clip to lock?

When I was replacing the bulb on my low beam, I was able to unclip the metal thing and then when I try to lock it back up it won't lock anymore. I think the area where it was supposed to lock got broken off or am I doing it wrong? I don't remember anything falling if it did broke off when I went to replace my bulb.
https://cimg3.ibsrv.net/gimg/www.clu...81445c49d3.jpg

I think you broke the teeth where the metal clip latches to you will have use a zip tie to secure the metal clip around the circled part.

https://i.postimg.cc/5ydPGyvQ/Screen...t-08-48-55.pngimghost

Would you know if there's a replacement part? I can't seem to find it anywhere online.

Junkyard or ebay for a used one. Toyota/Lexus dealer parts department for new, they can look it up. It may get expensive from a dealer, they may want to sell the whole light assembly.
In fact that may be the only way to get a used one.

Do you know what the part is called?

I think it is a headlight assembly for HID bulbs, I have a hard time being sure from your photo. I'm not sure if you need the right or left one. I saw a bunch of them on eBay, both used, and new aftermarket.
Look at this parts list from MyLParts.com
https://www.mylparts.com/v-2009-lexu...amp-components

You would have to buy the whole headlight.

Correct
This is not a replaceable part

@Tamenaz what did you end up doing to repair the broke clip tooth on the bulb housing? I had the same thing happen to me... sigh...