I'm pretty sure flush with the guards is around 19x8.5 +45 (If you're going 19's). Pretty sure anything +17 will have issues poking out of the guards, as well as possible not fitting onto the hub without hitting suspension components.
Having said that, I'm no expert on wheel fitment. But with my previous Golf GTI I bought 18x8.5 +35 and 18x9.5 +32 without doing my research and was unable to fit them due to these issues.
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