This super cute DIY Autism Shelf sitter Holds any of the  Wagon inserts. All the wagon add-ons will fit in this Shelf sitter.The Base is 13 inches long and is 6.25 inches Tall and the insert holder is 11 inches long. The shelf sitter will come with the inserts you see in the picture, and come Unfinished so you can put your own spin on them. Wood Blanks. Finished product not included for inspiration only. What a great way to display your add-ons!  Would look great in your entryway or on your entertainment center. What a great idea!