Weights for e36 interior components

Seat: 58.9lbs (x2)
Headrest: 2.3lbs (x2)
Rear seat base: 8.8lbs
Rear seat back: 8.7lbs
Front door panel: 7.5lbs (x2)
Rear "door" panel: 3.7lbs (x2)

All weights from http://bmwfans.info

Can you get a price for an additional rear seat from him