Is this the right HHR tie rod for a 2006-2011 Chevrolet HHR?

Yes. The TA5408 is listed as a direct-fit replacement for the 2006-2011 Chevrolet HHR; see the "Vehicles it fits" section for every listed application.

Is this an inner or outer tie rod end?

This is an inner steering tie rod end.

Is a track rod end the same as a tie rod end?

Yes. 'Track rod end' is the term used outside the US for a tie rod end; this Delphi part performs the same steering-linkage job.

What are signs a tie rod end may need replacing?

Loose or wandering steering, a clunk or knock when turning, and uneven or accelerated tire wear can be signs a tie rod end is worn. Have it diagnosed to confirm the cause before replacing.

Does it come with installation hardware?

Delphi includes the necessary accessories for a complete job. Consult the vehicle service information for correct torque specs and whether any fasteners are single-use.