Will 20 x 8.5J (no idea what J stands for, just labeled that way on ebay) wheels fit on my 03 G35 coupe (stock) without any modifications to the fenders/wheel well? the link to the item is http://cgi.ebay.com/ebaymotors/18-Ru...mZ250244773111
Thanks for the help yall.

The item you have linked is for 18" wheels.

But, if you are asking about 20x8.5" fitment, I think many people are running with 20's, especially with stock suspension.

Yes they will, however the offset on those things suck. 35 is more of a offset for sedans, than anything. With suck a high offset your rims are going to be tucked in your wheel well. I say go read some threads around offsets, in the Wheels & Tires section.

Hint, hint, look for at least a +20 offset and no higher.

Also check out this thread --->https://g35driver.com/forums/picture-share/210265-aggressive-wheels-stretched-tires-post-em-up-some-nsfw.html