Post mini tub tire combos?

So, no mini-tub? What's your backspacing on the rear wheels?
they are 15x8 1/2'' , w/ about 4 1/4 or 4 3/8'' backspace , the front of the fender wells have been recontoured , with the oriiginal shape , but taken to the inner fender panel . (forgot to put that in there !)
the prostars are not on it now (they were 15x8 with 4 1/2'' backspace , the rims on it now are actually perfect , and given to me by a guy on here that had them laying around in his garage for yrs. and wanted to get rid of them , all I did was pay the freight on them , "best deal I`ve ever had !" THANKS TO HIM , who ever he is/was .