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I recently bought front bucket seat belts (out of a GS400). The GM tag reads: 12B72 (I have two) and 13B72 - I have one. These are the female ends (with the buckles). Anyone know what these numbers mean? Do I need a second 13B72? And why? Thanks, Drew.
 

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B is the manufacturer plant code where the seat belts were made. 12 and 13 means the 12th and 13th week of 1972.
 
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