The two 4.56 BE COPOs Steve noted are well known in the hobby. Others are possible.
BT is the code for the 3.55 posi axle. 4.56 was special order only [COPO 9511] for '69. There is a 9511 Z/28 with 4.88s; believe that code is BX, same as '68.
Data indicates 997 L72 COPOs were built. Current body of knowledge includes about 450 cars. Plenty left to learn about COPOs.
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