I broke down and bought a new box of 5/16 18 x 3/4 slotted indented hex washer head zinc plated thread cutting screw for the three sets of rally caps I have. These are the correct ones for your rally wheels. I am going to have several sets of 12 left over so if you want them I will be asking 12.50 per set shipped. Replace your old dirty rusted ones with these new ones.
PT