Hmmmmm, I MIGHT HAVE some ashtray light sockets from our venerable '66 Newport, that stand a good chance of viability here. Download the parts catalogue for '66 and see if they're the same. I will have to dig, so if you're in a hurry, get something modern, but, Good Things come to Those Who Wait.... I have to dig a fair bit mind you, our locker has filled up a bit.