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RPO codes can be found in the glove box, on the trunk lid or hatch, or on the drivers side door jam near the latch. If you find the RPO code & it does not match one listed above for your particular vehicle, you should not use this harness. INST70-2054 GMC - Envoy 2000-01 w/ Bose System..................................................9 - Envoy 2002-04 w/ RPO code UQA...............................................8 - Envoy XL 2003-04 w/ RPO code UQA.........................................8