Bought this from Jay last year without doing proper research. It fits most Touring models but not Tourer which is what I have. Part number A9528009. $65 plus shipping.
If wide enough, just put 4 new holes in the back and fit it to your stock Classic Tourer sissy bar. The sissy bar pad has 4 Allen hex mushroom head bolts to fix, so just bore or drill holes in leather to match and use the same bolts from inside the bag to remount back pad. If you plan to load it up, add a flat washer under at least the top two bolts.
No I prefer them myself but I have that and the other studded stuff myself already! There seems to be a preference for Plain these days though. Not sure why not often you get somethin' extra for free!