What are these holes in my Suburban door for?

[RoyL]

Originally Posted by derail

That's the exact same thing I used on my passenger door and it worked awesome! If you can look inside of the door, I think most of the passenger doors have the backing plate already in the correct position with holes pre-drilled.

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?