these offsets are perfect for a G35, NOT a G37

 

Ok, not to hijack this thread, but I'm kinda clueless on the whole offset, spacer camber bit. Specs: 2008 G37S, currently all stock.

These are my plans: Vossen CV3's or VVS084's, 20x9 front, 20x10.5 rear. I guess tires would be 245/30 front and 275/30 rear? not entirely sure.
I will be doing a coilover kit, probly drop it 1 to 1.5 inches, so not too drastic
Do I need spacers? what size do I need? What the hell are stretched tires? never heard of that.
I don't want the tires sticking out, rather they be inside the fender when lowered

any info would be great! thanx!