The Aussie Mk2 Escort external door mirrors were sourced from the XA to XC Falcon's.
There are at least three different spacers available.
One version only suits the Mk2 Escort.
The correct version when correctly fitted will result in the top flat part of the mirror housing to sit level.
If the incorrect spacer is fitted the mirror housing will be tilted.
And yes there are left hand and right hand versions to suit the left hand mirror and the right hand mirror.
I can't recollect part numbers on the spacers.