Yes you do have to remove most of the rear end body parts to access these torque rods/hinges for our trunk lid.
I had a hinge go bad on mine. Just plain broke. PITA. I order the new hinge part ( special order non-stock item )
from the dealer.
I had the work done by my local body shop however. Cheaper then doing the dealer rates for this.
My suggestion would be get an estimate from a local body shop about repairing this. Order parts and pricing
is cheaper through them, then you buying them from the dealer and trying to do the install yourself imo.
Not sure what the current price is for these torque bars are, you can be sure is if one is bad, the other one
you don't replace is sure to go out soon. After replacement of the mechanical parts for operation of our trunk lid,
then the body panel alignment is key here. I would check with the body shop manager to see if in fact they have
worked on a Kappa before... making any commitments. Round about guess here would be $100. in parts maybe
with 2-3 hours labor body shop rates for this type of repair. Just make sure your happy with the end results here.
Does the trunk work right? Are the body panels lined up right? No noises or odd sounds from trunk operation?
You could try wholesalegmpartsdirect or one of the other parts sites listed here in the forum. This will give you an idea
about part #'s, pricing, availability, shipping info, etc. OR you could leave up to the body shop manager to source
the correct part numbers and pricing for this. It is his job after all or his parts guy that is.
I have parts drawings for our trunk, but no numbers or pricing info. I do have the PDF from the factory on Body
Panel adjustments, the how to for our car. These are just for reference sake and not as a guide for this repair.