[quote=James B W]- looks great but be careful you don't lose them when
'pressing on'.....

I have the same type, made by Allon Whites and they had a tendency to lift due to wind turbulence.
I fabricated some light alloy strips which go under the headrest
'pockets' and attach to the seatbelt guide bolts
Yes, I've had a couple of sessions grovelling around in hedges to retrieve my passenger pad that had made a break for freedom.
I really do like your idea James, are those alloy strips riveted into either side of the leather pad?