These spacers are made from neoprene rubber approximately 6mm thick. Three of these are used to space each of the rear suspension bump stops away from the chassis so that they will work effectively with the uprated coil spring assisted suspension fitted to weapon carrying M201s like the 106SR (photo opposite)

Without these in place damage to the coil spring assembly could occur before the axle reaches the stop. So if you are thinking of adding the coil spring units to your M201, don't forget the spacers! They can be cut from neoprene sheet and the approximate dimensions are 133mm x 46mm x 6mm. A total of six are needed, three for each side.