Yet another spacer question

SI-W85

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Ok so this is a question that seems to get mixed answers. The hub on our A4s is something like 16mm out, if I get 5mm spacers do they need to be hubcentric as there will still be 11mm of the cars hub showing? Also the same question but for 10mm as there will be 6mm of hub? And one more question is our bolts are 27mm long so with 10mm spacers I would need 37mm but they are quite hard to find so would either 40mm fit or 35mm basically will it take a 3mm longer bolt or will it be ok with one 2mm shorter???
 
Guess it's not a question that gets mixed answers lol it gets no answers ha:uhm: