I have the Fox Series R XL 0ne man bivvy but I need a wrap and /or inner dome for the winter, which you can no longer purchase as the Series R has been discontinued. However, it looks an identical structural design to the new Fox Voyager one man bivvy model. I wonder whether I can use the Voyager over wrap and inner dome on the Series R bivvy. I have contacted Fox International twice to ask-but they haven't bothered to contact me back. Does anyone have a view? or compared the two, or own the Fox voyager who could assist me? Thanks