Need to re-work sissybar pad

I mounted a new seat recently, Saddlemen Exlplorer, without changing the sissybar, Cobra standard.  This has caused an increased gap between the pillion and sissybar of about 1-2".  Momma ain't happy, says her butt hangs off the back of the pillion when she can reach the sissybar.  I am looking for a way to remedy this gap that doesn't look bad. 

The only thing I can come up with would be some kind of spacer between the sissybar and the pad.  Any and all suggestions would be appreciated.