While searching through Ebay, I find different size and shape tie down brackets. None of these look like the ones I took off of my '73.
http://www.ebay.com/itm/Tie-own-Brackets-Original-Ford-Mustang-Cougar-65-66-67-68-69-70-71-72-73-/400863292929?pt=Vintage_Car_Truck_Parts_Accessories&hash=item5d55506e01&vxp=mtr
http://www.ebay.com/itm/141568301531?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Mine:
I'm fairly certain mine are original. Variances in years?
http://www.ebay.com/itm/Tie-own-Brackets-Original-Ford-Mustang-Cougar-65-66-67-68-69-70-71-72-73-/400863292929?pt=Vintage_Car_Truck_Parts_Accessories&hash=item5d55506e01&vxp=mtr
http://www.ebay.com/itm/141568301531?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Mine:
I'm fairly certain mine are original. Variances in years?