Bought Ultimate seats, backrests and passanger arm rest for the Valkyrie years ago and I am still very happy with them, soooooooooooooooooooo. I just ordered a set up from Ultimate for the F6B I am getting the King seat and it looks like it is about 4 weeks out. The stock seat for me is good for about 300 miles and then I have had enough of it. I am planning a long trip or two for the summer and will be glad I have the new seat. It is a belated Christmas gift for me from me!