These 12.75" wall support bars are accurate reproductions of the originals and work smoothly with original hardware. They are designed to be used in conjunction with the wall support bracket set also available in my store. These are used for extra support for larger ceiling supported units, or when converting a ceiling supported unit to a wall supported unit, where ceilings are higher than 8.5 feet. **If purchasing multiple items, click "Add To Cart" instead of "Buy It Now" for combined shipping**