OK just to show you how I do believe that the green cowled version was from 1978 to 1980 and the white cowled Mustang followed in 1980.
Here is the green cowled one from a 1978 sales brochure.
[Linked Image]
Here is the one with a white cowl in a series 80's sales brochure.It was on eBay but unfortunately I forgot to bid on it (so I missed out),but as you can see it is from a series 80 brochure.
[Linked Image]
It's not the greatest picture but you can see that the cowl isn't the same colour as the base or catcher.
OH yes thanks Bruce for fixing up the YouTube links as well.

Here for a good time,not a long time.