for your 51? if so
The Steele gasket I used has a cut out for the rear view mirror
Pic

install the glass in the gasket, then the ss trim, then install on truck

Check out CurtB pics in your earlier thread
https://www.stovebolt.com/ubbthread...Main=100384&Number=700707#Post700707

or this one
https://www.stovebolt.com/ubbthread...;Main=96618&Number=667666#Post667666

Good luck