Bought a Lend A hand handle and have a couple of questions.

I added one, and didn't have a stud in the right location for the lower bolts. I purchased phillips head machine screws, drilled through the wall, trimmed them to the correct length to fit fender & lock washers and acorn nuts to cap the threads.

They are visible but don't intrude too much. you can paint them to match the interior wall if you want less visibility.