First twin pipes I have seen for the switchback, anyone know anything about these, and will they fit?

http://www.cruisercustomizing.com/legend-series-cannons-chrome-harley-davidson-fld-dyna-switchback-models-12-and-newer/part/SAM-D3S-901?utm_source=nextagau&utm_medium=cse&utm_campaign=nextagau&utm_content=92260

thanks
 

theres a few showing up now. fleabay shows a few
try
http://www.ebay.com.au/sch/i.html?_trksid=p5197.m570.l1313&_nkw=switchback+exhaust&_sacat=0&_from=R40