That is a replacement/rebuild part for an item that is already on your shifter if it is OEM; donít recall seeing those on aftermarket Hurst. It is inside the shifter housing between the shift levers and the side plate-the removable piece at the rear of the shifter housing. To replace it, or install one if missing you have to remove the shifter, however the rattle plate is a non-wear item and I doubt the problem. Obviously check all bolts/nuts for tightness. Most likely the problem is worn, missing, or rotted nylon or rubber bushings (depending on the year) where the linkage arms attach to the shifter levers and/or transmission arms.