Heater unit/ blower fan cover

Hi,

I need to get hold of a heater blower fan cover (the plastic item that looks like an upturned white plastic strainer. usually located under the plastic scuttle shroud) - mine is missing!

This is for an August 1979 Golf Series 1 Mk1

Two questions please -

Is this item the same/common to all MK1 Golfs or is the Series 1 cover different? (ie do I need a specific part/ number? for Series 1?) - my Haynes suggests that it is the same for "1977 on models" - is it? Suggestion is pre-77 and post 77 are different, mine being the later 1979….is this correct/ accurate?

Do you have the 'right one' in good condition I could buy?

Cheers