Correct Exterior Mirrors for 1969 K10 w/Custom Appearance Option?

[shiftinggears]

I have a 1969 K10 with the Custom Comfort and Appearance option.

Sometime along the way, a previous owner removed the original exterior mirrors and replaced with them with 3 legged trailer mirrors. The 3 holes for the original mirrors are still present in the doors.

I'm trying to determine what would have been on the truck originally. Based on the original holes, they had a single arm with a triangle shaped base.

Would they have been painted or chrome?

Would the mirror have been round or rectangle?

Any help would be appreciated.