I'm wondering if my truck EVER came with an interior rearview mirror? I've already purchased dual repro exterior mirrors from Jim Carter.

I think on Chev's of the 40's and eBay I have seen one with several detail lines across the back of the mirror housing. Are these correct for my truck? If so, where did it mount? The rear window is so small I wonder if it (ever?) was worth having one.

Pictures appreciated if you have one and how/where you mounted yours? Thanks, Dan