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Old 07-22-2011, 07:31 PM
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Join Date: Mar 2000
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According to the assembly manuals,
1973 PNs were 489182 and 489183.
1974 PNs were 493457 and 493358. And was changed to 496803 and 496358 on 10/12/73. Who knows when stock was depleted (or pulled) and new bars started to be used.