That be the ones we got too, Carl! Planned on installing the extension and the brackets while on the winter cruise but for some reason they are still in the basement. Maybe they will get installed when we get home now and then maybe not since we are thinking of getting a different unit so I may have some to sell or use it on the newer rig!
Who knows! Those are the ones woodtic and that's about the price I paid also. You might be able to find them at a woodworking shop if you have one in your area!