I just recently picked up a 1985 monte Carlo cl shell to use in place of my 83 ss shell because the 83 was rotted badly. The fuse box bulkhead connectors have been cut on the 85, so I figured I could just use the harnesses from the 83. Well the connectors are different so my question is can I just swap out the fuse box and bulkhead harness from the 83 or will I have to swap all the harnesses I.e. the dash and tail lights?