[rsk289]

Yes, that's the trouble - I've asked Koni about making some new Cobra shock absorbers, but they would require a minimum order of 100 of each (front/back, I guess - although the rears may be handed, not sure) which is out of reach for me.
I can take comfort from the fact that original cars had Armstrong dampers, I believe - which are similarly unobtainable but easier to 'looky like'.