Steelies

So I've read the posts on where to find 15x7 BBP steelies with 4.5bs.

I'm at the junkyard in Vegas and I found these on a 1988 Dakota.

15in steelies seem to be 15x8 but it's hard to measure with the tire on, 5x4.5 BBP but it seems like they have 5.5bs, is this correct? Would they work on the 8 3/4 a body rear end in a dart? I would measure it all but I'm not home where my dart is .

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