The opera lamps on my 81 Fleetwood Brougham are not working. I checked the trunk and found the inverter missing, so I sourced one on eBay and installed it. I haven't checked the voltages yet to confirm they are 12 volts/110 volts, however the opera lamps still do not operate. Mine are the thin horizontal models between the front and rear doors. I have not been able to find NOS replacements, or any replacements at all for that matter. Any ideas?