I was originally going to use the same holes, but it didn't pan out. So I drilled new ones. And that put the mirrors higher up than I originally planned. That's why they had to be angled for A-pillar clearance.
If someone were to plan out the project better than I did, they could avoid these issues.
If/when I replace these mirrors, I'll use ones with straight stalks (without that 45-degree bend), so they stick out straight from the side of the car. That should take care of the clearance issues.
Here's another closeup shot:
You can see the "stub" where the stock mirror used to attach. I drilled a new hole for the motorcycle mirror, and bolted it on with washers to spread the load.