Are the side mirrors off a '70 Nova the same ones as the '69 GS400? I need new mirrors and those are the closest I can find without being plastic reproductions.
No the remote mirrors on a 68 and 69 are not reproduced and were not used on anything but Buick. The nova mirror are different The non remote mirrors are reproduced for the passenger side but I heard a while back they were out of production. The Driver side was never reproduced you need to go used or find a NOS one. Beware finding a mirror without the mounting bracket or gasket they can be tough to find as well.
The mirrors on my GS are non remote and the ones I found that came off the Nova are non remote and have the mounting hardware. Closest thing I have found visually. My driver mirror is plastic so it's been replaced at some point and there are holes where a mirror used to be mounted on the passenger side.