Dear Louie,
Good p.m. and may this find you well. I don't think you need to remove the rear seats - sedan or wagon - to get two wires from the passenger compartment into the trunk (sedan) or load space (wagon).
On the driver's side, the door sills form a conduit, along which the radio antenna wire runs from the trunk/load space to the underside of the dashboard. To access this area, you'll need to remove the three plastic caps over the screws, that hold the the front door sill moulding (plastic).
You'll also need to remove the bottom cap in the "B" pillar (use a small, flat-blade screwdriver, to pry out the cap). Once you remove the screw (T-20, I believe) you can g e n t l y pry-loose the bottom of the B-pillar cover.
Once that is loose, you should remove the plastic cap, over the screw, that secures the rear door sill moulding (plastic). To remove the moulding, pull it gently, towards the front of the car.
You should now be able to run the wire from dashboard, to the point where you need to fish it into the trunk/load space.
Working from the point, where the wire heads under the rear seat, you should be able to push a piece of coat-hanger wire - the end of which you've doubled-over, so the tip is rounded - along-side the antenna wire. When you double-over the wire, put the end of a length of nylon seine twine and crush the wire over it.
Once you push the wire past the rear seat and into the trunk / load space, you'll have a piece of seine twine, to which you can tie the ends of your new wires. Make a slip knot in the seine twine. Put the wires through the loop. Fold the the wire over on themselves, leaving a 2"overlap.
Use electrical tape to form a smoothly tapered "cone" (like the nose cone on a rocket) in front of the loop in the seine twice, to the point, where the ends of the new wires are covered up.
You should be able - from the trunk or load space, to pull the wires past the seats. If the wires stick, resist the urge to yank. Go back to the passenger compartment, and pull back a couple of inches. Then, try again.
If the wires hang up again, look at the taped point, to see if the tape has come loose. If so, re-tape and re-try. With some patience, I think you'll find this method works.
Hope this helps.
Yours faithfully,
spook
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