I purchased a GM NOS side view mirror for my 66 442 but the Fusick side view mirror has a different base. I am wondering what is correct maybe the NOS mirror is for the passenger side. Can someone please help identify what I have.

Thanks

 

One for a B body one for an A body?

 

The one on the right with the smaller base is correct for a 66 442.

 

Thanks for the help much appreciated