Rubber trim on back of slide

Hi. The top and bottom long rubber trim piece on the back of the slide broke off; the top one looked like it had some sort of secondary piece?? Any answers about what they are, if they are important, and how/what to replace would be greatly appreciated! in the photo, the green "good" is the left and right sides, where the trim still is, and the red "bad" top and bottom is where you can see the screw heads and the trim came off

I purchased mine off eBay, better price and free shipping.  It is called 1" heavy duty insert trim and comes in black or white.  It is produced by rvdesigner and comes in a 100' roll.  Insert the trim when warm and do not stretch the product when installing, otherwise you will be disappointed to see the trim 1"too short on the corners.