Add 2 more legs to your 12" wide grab bar for a total of 4 legs. Total grab bar length from front to back would be approximately 13". Total width would be 12". Inside width between legs is approximately 10". Height of these legs is approximately 10"
*YOU MUST ADD A 12" GRAB BAR TO YOUR CART IN ADDITION TO THIS LISTING. THE FINISH CHOSEN FROM YOUR GRAB BAR CHOICE WILL MATCH THESE LEGS*