I guess this is common being a 1965 Valiant. My original turn signals work but I need to change one bulb but I can't get in a new bulb. I got some spare signals on eBay and the bulbs are frozen too in the sockets. I can obviously get the old bulbs out but the spring inside the socket must be frozen keeping the new bulb to be pushed down and locked in. I tried pouring some rust remover in the sockets and letting it soak but they didn't free it up. What else can I try?