Just got mine yesterday in the mail not sure what straight pieces your referring too. I just took mine out of the plastic and locked it on the rear. no assembly on my part.
(just a sample pic, couldn't find one of the solo cowl upside-down)I put them on the bottom flat parts that hook onto the bike
I received mine and with it came a plastic bag with 4 stoppers which presumably fit into the holes underneath, but there were also two straight pieces that I have no idea what to do with.
Anyone with one of these know?
OkayPictures please of what came with the Rear Seat Cowl.