17x9 cobra r

Hi, I was just wondering what the difference between Ford SVT mustang cobra r whrome wheel M-1007-R50C and Ford Racing Chrome SVT mustang cobra R wheel wheel M-1007-C58? I would like to know what the differences are and if one is better than the other. Thanks, Bryce

i have 2 pair of black cobra R's for my mustang.. ive bought new falken 275/40s for the back:bigthumbsup i have an 80 stang, what is the smallest tire i can fit on a 17x9 rim? i heard a 235/45 would work, but i get a lil rub, anything smaller?? all help is appreciated :)