Models - 16 " seat with swing-away footrests and full arm : PLA416FBFAARAD-SF - 16 " seat with elevating leg rests and full arm : PLA416FBFAARAD-ELR - 16 " seat with swing-away footrests and desk arm : PLA416FBDAARAD-SF - 16 " seat with elevating leg rests and desk arm : PLA416FBDAARAD-ELR - 18" seat with swing-away footrests and desk arm : PLA418FBDAARAD-SF - 18" seat with elevating leg rests and desk arm : PLA418FBDAARAD-ELR - 18" seat with swing-away footrests and full arm : PLA418FBFAARAD-SF - 18" seat with elevating leg rests and full arm : PLA418FBFAARAD-ELR - 20" seat with swing-away footrests and desk arm : PLA420FBDAARAD-SF - 20" seat with elevating leg rests and desk arm : PLA420FBDAARAD-ELR - 20" seat with swing-away footrests and full arm : PLA420FBFAARAD-SF - 20" seat with elevating leg rests and full arm : PLA420FBFAARAD-ELR - 22" seat with swing-away footrests and desk arm : PLA422FBDAAR-SF - 22" seat with elevating leg rests and desk arm : PLA422FBDAAR-ELR - 22" seat with swing-away footrests and full arm : PLA422FBFAAR-SF - 22" seat with elevating legrests and full arm : PLA422FBFAAR-ELR