Where to mount external mirror.

I have a 1973 Dodge Dart Sport. It came with a factory mirror on the drivers side. I picked up another OEM mirror and the swap meet in Indy last month for the passengers side. I wanted to know if the mirror I bought for the passengers side should be mounted in the same spot on it's door as the one on the drivers side. I think that it would but just want to make sure before I start drilling holes. Thanks.