I have that exact same style tire but 27" tall (27x10.5 MT ET Street) mounted on my spare T wheels and the fitment is excellent. The ones he is selling should have the same dimensions as a 28x9 MT ET Drag slick, so they should fit the stock GN wheel as well with no issues. FWIW, the 28x12.5 MT ET Streets are nothing more than a 28x10.5 ET Drag slick with a DOT number and grooves cut in them.
HTH
Patrick