Can you please elaborate which section or what "top" were you referring to?
We have a bigger item available that is 24" high. The model number for your reference is 38114.
The frame has runners on the side to be only used with the widest part in the front.
Thank you for your recent inquiry with The Home Depot. Because this item is only available in Home Depot stores, I believe the best advice would be to talk to one of our many specialty department professionals at your local Home Depot store. For any other questions, please visit your nearest local Home Depot store or call us at HomeDepot.com Customer Service 800-430-3376.