I didn't even know they existed until just recently.
I'm looking for a set of the chrome side mirrors with the chevron shaped LED turn signals hidden behind the mirror. I am under the impression this was a 1996 model year only option. It is probably only on higher trim levels like the Eddie Bauers and XLTs, but the LEDs should be just barely visible when you look across the glass. Let me know price with shipping to 94566.
Off (LEDs barely visible behind the glass in the corner)
i know this thread is like 39 years old now. but in case you never achieved your goal you can always just get a regular 96' (or repo) power mirror and simply add the turn signal yourself. there is a DIY turn signal kit by Shark Racing located here complete with instructional video.
BTW i did this to my 1990' f-150 xlt lariat and it looks OEM. (NOTE: i added 96' power mirrors, panels, and what-not to it so it does look OEM as far as a "1996" door model is concerned)