Found the documentation for this question in my 08/74 MPC.
Early 1970 T37s, Tempests and LeMans used the clear parking lamps. Later production '70 model A-bodies used the amber lamps. Unfortunately there is no mention of the production date or VIN break when the change-over took place.
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Regards,
"455HO" Lloyd
2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98
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