The Lokar 1955-1957 Chevy billet aluminum throttle assembly is designed to convert original rod linkage to Lokar's modern throttle cable system. It is designed to mount in the original firewall location with offset bezel washers to align throttle cable through firewall. The throttle pad is spring-loaded like OEM design and removable lower arm is splined for versatility in mounting to the right or left of the mounting bracket. Lokar's exclusive upper arm is a one-piece design. Shaft and arm are one piece, requiring no pins. Outside dimensions of the throttle pedal measures 2 x 5 inches.