I have (4) 15x7 polished aluminum Center Line Auto Drag wheels.
I measured back spacing to be about 3" but based on what I can find on Summit Racing, the back spacing is probably 3.313".
My father had these installed on his 1987 Buick Grand National but he upgraded to Telstars with conical lug nut seats and drag radials.
(1) is brand new.
(2) already have Nitto tires in good shape with plenty of tread.
I have a complete set of chrome-plated shank lug nuts and washers for them but they are partially rusted for some reason.
I have 3 plastic snap-in center caps - 1 fits good, 2 fit loose.
$650 for everything plus shipping.
I can probably ship to most places in US for about $100.