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The following RPO codes appear on my service parts identification label:
ISA I'm assuming that is 1SA - Option Package 1
BGR Bowling Green, Kentucky, USA
VM3 'CONSUMER, CONTAINS BPR IMP STANDARD FOR FRT 5 MPH & RR 5 MPH
DL5 ROADSIDE SERVICE INFORMATION
IAZ Again I assume 1AZ which means Orders Sold. IAZ is RED SPOT PAINT & VARNISH CO. (B/C/H/J/N/S/U/V/W -TRK CKGST)
RNZ No listing for this one on my master GM RPO list.
What do they mean? All the others are in the service manual.
Also, thanks for all your help and comments on my F45 ride control problem.