You need to make sure that the mirror assembly is fitted to the top of the motor first ( 3 torx screws ) then fit the bottom of the motor to the stanchion ( 4 screws )
That's because the top of the motor will only fit one way so get that done first as you know it's correct , and then you only need to line up the bottom in the right position.
If you do it the other way around you can end up adjusting the bottom only to find the top doesn't align and so on
Pictures below which will hopefully explain it better !
Robs Car Gallery
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Planning is an unnatural process, much better to just get on with things, that way failure comes as a complete surprise instead of being preceeded by a period of worry and doubt