These old greenhouse clips can be impossible to find. Your best bet might be to cut and bend your own aluminium strips. Some greenhouse spare places sell bendable aluminium strips but they may not be the length you require or strong enough.
those already look like bent aluminium strips. Completely different sizes. Not entirely sure what they are use for but I think you will either have to make some yourself or use an alternative like clothes pegs or small clamps - again not sure what they are used for.
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