Don't have the exact answer to your question, but here's what I have in my collection.
The '70 VN built 05D, has springs whose O.D. measure 1.340". All the other '71-up measure 1.620 - 1.660". So at least at Van Nuys in the 4th week of May, the smaller O.D. springs were still being used.
BTW, I'll state the obvious, '70 Camaro & FB hinges & springs were the same part numbers, so no differences there.
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