Good grief! How short is this guy!? The 883 is not exactly a tall bike to start with. Look for information on the 883 Hugger model. It had a 27" seat height. Getting a seat that narrows at the front will help keep the legs from having to be spread so wide which in turn helps flat-foot easier. Here's a kit that might help.
http://www.jpcycles.com/harley-sport...-lowering-kits