Mike,
The El Camino gaskets are unique compared to the other model gaskets. They have a sort of "V" cut into them to be able to straddle the upper bodyline.
I had a set of those mirrors, but non-power. I got the gaskets from a member of another forum who graciously gave them to me. I later sold the mirrors complete...I decided not to use them.
The last place I saw those gaskets offered was Lauren Engineering. http://laureneng.com/new-products.html
Scroll down and you'll see them on the right side of the page. I knew I saw them before.
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