[78T/a]

Hey Guys

I have a 78 Trans Am. Looking to get a new set of rims and tires for it. I have 15
" cragers now, but they stick way out past the fender in the back. If i were to stay with the 15's what measurments of rim should i get such as backspacing and what not, and what size tire would fit . Also if i where to go the 17" route what measurments would i be looking for there

Thanks Mike