Inner ball cover for 401 gearbox.
 

Can anyone help? I am looking for an inner ball cover for the gear lever on a 401, it retains the spring and is part number N450780 I did not realise it was missing when we got the car as the lever itself had been removed for re chroming and its only now its being put back together that its absence has come to light.
If you don't have one but know of a source that would be equally helpful.
Geoff.