While I am a fan of steelies, I think that the right 5-spokes can look great on a truck. I do think that the "flat-spoked" wheels don't look right on older vehicles. While I personally think the "arched/rounded-spoked" wheels look great on on older vehicles, they don't look right on newer vehicles. I think for me, this is all due to the lines and blended contours present on older vehicles and the sharp lines on late-model cars and trucks.
I think those wheels would look good on a square-body but not so much on a pre-'73. But that's just like...my opinion man.
EDIT: just notices they are 6-spoke. I am definitely out now...