What are these holes in my Suburban door for?

[oem4me]

Originally Posted by RoyL

Is there enough room in there (inside the door) to mark or drill a small pilot hole to get them in the correct factory location?

I couldn't tell you if there is room enough to mark the hole locations from the inside without looking, but it would be simple enough to make a paper template from the drivers side exterior, and then use it inside-out to mark the passenger side. That should get you pretty close.