If I had the extra money I would pick them up myself for a backup set. Don't see these real often...and I don't think any aftermarket makers make these.
http://www.ebay.com/itm/1973-1974-1...t=Vintage_Car_Truck_Parts_Accessories&vxp=mtr
http://www.ebay.com/itm/1973-1974-1...t=Vintage_Car_Truck_Parts_Accessories&vxp=mtr