The 91-93 RMs (sedan and wagon), Caprice (sedan and wagon) and the OCCs should have similar if not identical harnesses. I do not know it the pinouts for the ECC connectors are the same for the cars, but they should have almost identical harnesses if they have ECC. There are only the ECM connectors, C205 and C204 connectors,, and the vacuum line connector on the interior of the car. There is a Caprice in the local yard, and if the harness has not been molested, I can get one on Monday. They are proud of their parts here, and it may be a little expensive. I believe I have a harness with a few connectors missing if you want to repair it. I can give you a good deal on it if I can find it.