I had to go out and look at my DHC having read this thread.
It was first registered 1st August 1982 and it does have the gas struts but I never knew until I just looked!
This is because it also has the early boot lid stay with the lower bracket held in by 2 screws! I think I'll be looking at that fixing tomorrow[;)]
No plate on the doors with build date though, maybe that's only found on non UK cars.
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Project Manx 2010 (now a bit delayed!) - I wish I could drive a TR7 like Tony Pond
North Yorks/Lancs border