i have been searching the forum for the info already and i can't find a common answer for the offset of the stock '84 GSL 13x5.5 rims? i have seen +24, +28,+17 does anyone know the correct offset? and to clarify which rims, here is a picture. thanks in advance.

 

I measured the rims yesterday. for future reference, the backspace is 4.3125 in. and the offset is +27