What is this part?

[Joshawa]

Hey all! Went today to change my LCAs and noticed this was cracked, what is it called and where can I find one? Thank you!

 

[pragmatic]

Rear tie rod also called rear tracking link. Looks like yours need to be replaced

 

[joegr]

Also known as rear toe link. I'm sure you'll need to replace both.
6W4Z-5B551-AA - Ford Parts Giant

There are lots of threads on here about them.