headlamp adjuster screws

[ChrisG]

Headlamp adjusters.
Type 81 ( and no doubt numerous others ).

I got two seized up, tried all the usual methods, including a two week application of releasing fluid, and have now managed to round off the crosshead as well !

So are these still available? Part number?
Does anybody have a couple of secondhand spares they don't need?

So far I've canabilised a spare broken lamp and -
rounded off another -
and can't budge the other one !
I've found that popping the screwdriver slot end ball out of the plastic first makes turning the screw easier in order to free them up. This obviously helps to reduce the tension/friction on the screw end ball.
Needless to say the others are all well lubed and are not likely to sieze or go rusty again.

Thanks.