Peter, I have found some pictures of what I believe is a 411 S2 from an owner in Ireland which might be helpful - the engine has been upgraded so I have attached a close-up of the heater cover and the full engine bay.
It looks like the bottom of the vinyl cover is secured with a metal strip. From memory i think it is has a flattened C section shape and is made of steel.
I can't say whether it was riveted or screwed in place. The photo is not quite clear enough to see.
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