The "deep-dish" Fuchs wheels were only made in 6x15.
They had only one "hump" (H1) so they were not that safe for lateral forces which increased with better tyres. Therefore, they were exchanged by H2 rims later on, known as a standard for SCs front. These are the more common 6x15.
I have not found a single reference that 16 or 17" wheels were available from the factory at that time.
Remember, that the standard diameter in the '70s was 13" on european cars.
Jens
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