Here's one I just got in, it had a couple of wrinkles, but it came out fine.
As you can see, the truck mount has a big screw that sticks up and blocks any possibility of installing a roller. I first replaced that with some shims and a screw that fits flush below the line between the truck sideplate mounts. I put small spacers around the screw to prevent the truck from moving side to side, it's secured the same as with the original screw.
Since the sideplates have screws securing them, I just lengthened the inside two so I could bolt on my .062 fiberglass mount. The roller is mounted on that plate as well, and the wire snaked inside the tender.
If I don't have a convenient screw, I typically bond the fiberglass mount to the truck with Loctite 380 BlackMax adhesive.
