Hi Jeff,,
You said "...and for some reason they were later installed from the outside,..." Isn't the reason cost savings? I believe the back seat no longer required removal along with the quarter panels to gain access to install ducting parts. If the duct fittings and hose could be installed from the outside, considerable labor cost savings could be realized. What do you think? I think they made this change too late in the production (...somewhere between approx 6S2020 and 6S2070.) to fully benefit the savings.
Cory