I fitted the 2015 storm covers to my 2013 18.56-6. It took a bit of fiddling to get the install to the point I was happy but the end result looks what I believe to be factory. I searched this site for pictures, however, did not want to attach the sail track to the outside surface of the bed end. I ended up reversing the brackets which hold the gas struts to the lid and ran the sail track on the outside of the struts. This does mean to Open and close the bed end I need to remove the sides of the cover from the track, however, this is pretty simple and the cover can remain fitted during transit. I’ll try to attach some pictures, however, I don’t have any close ups. I am also sure they could be fitted quite a few different ways, however, this seemed to suit my needs of a clean install and ability for them to remain fitted. I can take some more pictures next weekend if you would like some further clarification.