Dad's Dart (or one just like it) Restoration

I'm hoping I can get them tight without chipping the paint. I hope these plastic socket inserts will help.
http://www.summitracing.com/parts/bjo-wi-5m-xngl/overview/
They are only available in metric. But the 13mm should fit the 1/2" bolts and the 14mm should fit the 9/16" bolts.

On closer inspection, the set does not include a 14mm insert. Not sure if a 15mm 6-point insert will work on a 9/16" bolt. I guess I'll find out.