My '71 Duster has the original style 14" rallye wheels (5.5 in. sbp) and I would like to go with wider tires in the back while keeping the rallye style rim. Summit has rallye style chrysler rims that are 15x8 with sbp and 4.625 backspace. would these be a good option for my Duster? Also what tire size would be a good match. Thanks!