I too have a riser and been looking for the top caps for the handle and riser. Could not find one that will fit. I do have a extra use one but with no cap.

Hi RCF and welcome to the Plumbing pageat at AskMeHelpDesk.com. You piggybacked on an a 4 year old dead thread so I gave you one of your own. In the future, before you post, look in the upper left hand corner for the date.
Call 1-800BUYMOEN and ask them to send you a cap. Good luck, Tom