These DO NOT fit the stock traxxas stub axles. These are only to be used with the BAS/WFO steel stub axles. These only fit the V2 stubs with the removable grub screw.
These add 10mm, 16mm or 19mm of width to each side of the truck depending on the size you choose.
You will received one set of four hexes with the longer grub screws to match.