i wanted dearly to own a car that was unique...
and with nobody but buisnesses rolling out the HHR panel truck in my town i figured it a safe bet id be the only one on my block useing one as a personal daily driver... and i was right...
but bringing friends along for the ride proved dificult... so i found a guy who deals with wrecked HHR's... and i bought a set of rear seats and seat belts form him...
yanked out the cargo box and dropped in the seats with factory hardware and safety belts and havent regretted it since...
who else has done this to there panels..?
altho its spendy and a bit of a pain to find all the parts i highly sugest everyone with a panel drop a set of seats in the back... plus they fold flat and you still have all that cargo space anyway... how can you lose..?

 

https://www.chevyhhr.net/forums/how-tutorial-library-21/installing-rear-seat-07-panel-11077/ Many have already done it.