problem with 15" steel wheels

The wheel maker probably used 13" centers. They are a lot easier to find. Know that 14" SBP steel wheels cleared the KH calipers since that was what was on dad's '72 Dart. Summit has wheel spacers but the closest bolt circle is 5X100mm. They will go on a 5X4 but they are a few thousandths smaller and will cause the wheel studs to break, so you will have to open them up a bit on the inner edge. Hope this helps.