Hi chotus52,
I agree with you on the part no : 42-9072
I've looked at period brochures of A7 Shooting Stars and the seats for 1955 did not show any piping. I have since discussed with RK Leighton ( and he has confirmed that this is correct.
In case you're not aware, Leighton's are over in the UK and have been covering seats for many years.
Steve