considered this jono ,

way i see it you got two choices


either get a cpl headrests , and with the cushions removed from seats allign them were you want them , find a bit of suitable diamater tube and weld it to the seat back
have your trimmer stich up a small hole


or , go by a cheap mk 5-6 esc rear bench , strip it , rob the mounts and slider tubes and do the same it you want them to function at diffrent heights and same again , give the trimmer the small black grommits that sit in the fabric and have them stiched in ,




beef