What other applications were made of the rear seat-frame y. that was used in the 1965 Chevrolet Caprice?

Knowing that automobile manufacturers use various applications of certain components during each model year, I would like to know in which other vehicle(s) might I find the rear seat-frame embly that was used in the introductory 1965 Chevrolet Caprice (4 door hard-top Sport Sedan). That particular application used a center arm-rest that recessed into the back-rest cushion whenever a third penger occupied the center of the rear seat. Some other vehicles also used a similar arrangement for the front (bench-type) seat to accommodate a penger.in the center position. Thank you for any and all istance rendered.