Hex ball studs for the inner damper tube ball cup. This is the standard mounting method for all CRC cars from 2016 and beyond. WTF-1 FC16, Gen-X 10RT.... and so on. Requires 14331 stainless 3/16 button head or the 14332 red aluminum 3/16 x 4-40 button head. Older cars can be converted with a 7/64 drill.