From John Stanley Antique Tools -

Victorian Cast Iron Shelf Brackets Same Pattern Different Size Original 'J'

The sizes are shown in the photos.  Both brackets are all good.  

For an eclectic look using two different size brackets, you may want to consider making a shelf that is tapered from one end to the other.   This is a very unique look.   

We will be listing other brackets as time permits. We may have the one you need. Keep us checked.

We will gladly combine items to save on your shipping costs when practical and possible.  While here why not visit our ebay store where we have hundreds of items listed.  Enter key words in the search bar to find certain items or browse by store category.  You may be surprised at what we have listed. Check out our other items!  Be sure to add us to your favorites list!