Solutions
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Grumpy Finn's post in MK2 and Mk3 Octavia wheels and winter wheels was marked as the answerOcty III standard alloy wheels (no chains) are: 6,5J x 16 ET46, 7,0J x 17 ET49.
With snow chains: 6,0J x 16 ET48-50 with 205/55 R16 tyres and 6,0J x 17 ET45-48 with 205/50 R17 tyres.