Returning to stock wheels

[DgoT4R]

I just aquired an '89 4runner that's in really good shape. I want to lose the AR chrome wheels and 31" tires and go back to stock. Should I look for used Toyota wheels or just buy some aftermarket wheels? I believe the stock rims were 15x7, 6 on 5.5 but I'm not sure about the backspacing. Any help or advice is much appreciated.