Spoiler alert!

[ProtoTipo]

But all my Stradale models 1:18 Black,Blue,Red,Yellow,Lt Blue,Green all have spoilers and described as 1975 road versions,so im guessing by 1975 they would have been std fitment for homologation?

None of the Stradale production run were fitted with roof wings and spoilers at the time of manufacture.
There was an odd one that was trial fitted with the wing and rear spoiler. Curiously, these were colour coded.
As time went on, the unsold Stradale cars would have been fitted with grey metallic coloured roof wings and rear spoilers, before they were sold new.