1966 c10 backspacing?

[wabash15]

ok question about steel wheel backspacing. I currently have factory 6 bolt 15 x 8 ralley wheels from a 1984 chevy squarebody on my 1966 c10 with factory drum brakes that I am not changing to disc anytime soon. The backspacing is 4". I am looking at wheeltiques 6 bolt 15 x 7 or 15 x 8 steel wheels with the nubs for the original like hubcaps.The problem is the current ralley wheels with 4" backspacing are @ 1\4 from the tie rods currently. The wheels I am looking at seem to only come in 4.25" backspacing. Who has done this? Did things fit ok? Do not want to spend $ to find out I have fitment issues. Thanks