I believe they're Zeniths, 18 x 7.5 ET51.
Pretty sure you'll find the fitments for the Skoda will be similar to the equivalent Golfs, possibly with a little more room in the rear guards again.
Something in the 18 x 8 ET45-48 range would look good and not generally cause any rub issues - you can go up from there but then risk the possibility of scrub depending on your suspension.
Would recommend checking into what some of the Skoda guys have done as I am far from an expert.
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