UP FOR SALE IS A PAIR OF SOME KIND OF SLIDING BRACKETS? LUGGAGE RACK? BOAT HATCH ? NOT SURE WHAT THESE ARE OFF OF? .... VIEW ALL THE PHOTOS MAKE SURE OF YOUR APPLICATION. IN GOOD USED CONDITION . COMPLETE HAS KNOBS AND ALL IN GOOD CONDITION..... IF YOU KNOW WHAT THEY ARE ANY HELP WOULD BE APPRECIATED...... ASK QUESTIONS, THANKS FOR LOOKING......