Another thing to keep in mind is that not all of the 5x5, 15x6" wheels were created the same. Some had a smaller diameter center (if memory serves, they're JU code from 69-70 big cars) and they don't look the same externally when side by side with other 5x5 wheels.
This summer, I sourced 4 5x5, 15x6" Rally II's for my 74 Bonne, and I ended up with two KY and two HY code wheels. They match up nicely on all measurements, and they're listed for 73-76 big cars. No clearance issues with the big discs on my car either.
Lastly, the 5x5, 15x7" Rally II's were supposedly on 77-81 big cars, and carry the HH or KD code from what info I have.
Hope this helps. Good luck finding a set! They really make the look of the B-bodies IMO.
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Eric Mitten
'74 Bonneville 4dr Sedan (455/TH400/2.93 open)
'72 LeMans GT (455/M-13/3.23 [8.5"] posi)
'71 GTO Hardtop (400/TH400/3.07 12 bolt posi)
‘71 GTO Convertible (455HO/TH400/3.23 posi)
'67 GTO Coupe (455/ST-10/2.93 posi)
Deuteronomy 8:3
