This is a right front door window regulator from a 1941 through 1948 Chevrolet or some other GM marques according to other listings. Lever arm centers are 9" and the winder to gear center is 3 1/2". I have another one of these that is slightly different. It has a 9" arm, and the winder gear centers are 3 3/8" The arm is straight and with a different roller (or no roller in need of one) . If it makes a difference, please indicate your choice when making a purchase. Good condition and Free shipping, usually same day.