Very easy to fit - just take the bung off the end of the handlebars and the bolt screws and holds then in place. I seem to recall I added a cable tie too as I had the Black Inazuma (the fast one) and they did move slightly at 65+.
Price is for a pair. I would have got some for the Harley but she never goes out in the cold / wet (she is a lady you know!) so it would be pointless.