New Style Belt is a direct replacement for the “gray” belts used in all of the newer model Leslie speakers (122A, 147A, 122XB, 971, 3300 (lower belt only), etc.). This belt is used for both the upper and lower rotors of the Leslie. A quick way to determine if your Leslie is of the new style is to examine the Leslie motors present in your Leslie. Newer model Leslies use one motor to control the slow and fast speeds while vintage Leslies require two motors.