I dont know if this will help, but I deleted mine and re placed them with smaller ones in a lower location. They were the surface mounted ones that started in 73. The new ones came off of a BMW.
Andrew
just look for cars made in 67, the last year with no side markers.
I've had to fill the front marker lights on a couple of duster fenders because it would take me forever to find a clean one for my 67 valiant.
careful welding though, they warp easy.
I did away with them on a 71 Duster a few years ago.
Looked great no problems with the law.I'm going to weld
them shut on my 74 Scamp but not to that point yet.