17x9 Advan RZII +63 w/ 255 tires square. I went with the V8Roadsters Stoptech STR43 kit that Ricky Flowers helped develop. It's a bit more friendly with higher-offset wheels as opposed to other BBKs, but not by much. Even with the +63 offset up front on a 9 inch wheel with a 255 tire the fit is still very tight on a lowered car. I do know that Adam still did some minor modifications to his front fenders, I believe he bent the tabs upwards slightly, but not a full on roll of the entire lip. At that point every mm helps, so that's why he and myself as well were splitting hairs with the sizing of the spacers. I believe he milled down some 3mm off-the-shelfers to 2mm. I personally don't have access to getting stuff machined for me, and if I paid someone to mill mine down I might as well just get some bespoke ones made to my specs instead; they were still very expensive though, I doubt many people would bother, but given how much thought and money I've put into my planned build so far it wasn't a stretch for me to opt for them.

Here's a pic he posted of his setup without a spacer, I believe he said it was about a credit card's worth of clearance or 1mm-ish, I believe most BBK manufacturers call for around 3-5mm of clearance between spoke and caliper typically.