Description Dayco is a leader in the Original Equipment Market – partnering with global automotive and industrial manufacturers to design, develop and produce high quality products for light duty, heavy duty, industrial, agricultural, off-highway and recreational vehicles. Part #’s 1K0-122-051-CM / 1K0122051 CM / 1K0 122 051 CM / 1K0122051CM 1K0-122-051-GL / 1K0122051 GL / 1K0 122 051 GL / 1K0122051GL.