sofa seat back

[susanborck]

hi...two questions: i have a 1993 excella which, when i purchased, was missing the lounge sofa back cushion. i suspect a few things: that a cushion sets down in the 'well' behind the seat cushion where the batteries are stored and that 3 individual seat back cushions may sit in front of that. the initial cushion would insure you do not hit the blinds/curtains/windows with your head when you lean back on the sofa. my owners manual states that the long, main cushion which may sit in the battery well is removed, attached to the seat cushion in front and extends the seat cushion to convert to a double bed.
therefore, my question: does anyone have a '93 or similar excella who may be able to describe/send photos so i can understand how this was originally configured?
also, the airstream factory parts dept. told me the original mfg. was jone furniture from whom they have not purchased product since '99 and who appear to be out of business. i cannot buy the part from airstream (as they do not break up the sofa but sell it in its entirety).
second question: does anyone know an alternate vendor who may provide? (am not particular as to the covering as i intend to reupholster to match my 'new' sofa1) does anyone know where i may be able to find one used (have searched the web and have come up empty handed.)