Not sure this will help but many rear seat passengers have felt a little uneasy with the Deluxe stock backrest being so low. I installed an adjustable height bracket that the Honda dealership out of Storm Lake Iowa (712) 732-2460 sells and my passenger loves it. I paid $150.00 at the time, not sure what it is now but well worth the money. Might be a much more cost effective solution to make your passenger feel secure.