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Well, I have 9.5 ET30 at the rear and my wheels are fairly flush - I could maybe get another 10mm without them being obviously poking. Note though that I don't have the fender flares, which add another 4mm to the width of the fenders.
10.5 ET32 vs 9.5 ET30 is 10.5mm more poke so you'd be fine, particularly if you have fender flares. However, you'd also be 14.5mm closer to the strut than me. There is way more room to the strut at the back than at the front, so maybe this will be OK, although with a 275 tyre, my guess is you risk rubbing. The problem then is that if you need to fit a spacer, you are almost certainly going to end up poking beyond flush.
None of the UK tuning retailers (AutoID, Motech, R44 etc) have gone bigger than 10" at the rear. You could look at Apex Wheels excellent thread on here which might give you some guidance, but you should also talk to ESR and see if they have the wheel well dimensions for the G42 and ask them to confirm fit without spacers.
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