Hi Paul,
It's a long time since I had some of these.
If I remember correctly the whole strut, springs and alloy spring seats were made especially for the Hawk (pre GAZ).
I think the top alloy seat sat on a shoulder? The springs were flat, top and bottom. 'Not as large a diameter as the standard Beta springs.
Dave at Dampertech might be able to help?: http://www.dampertech.co.uk/
Here's what mine looked like:
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