Rare model Air Filter very hard to find. For the CL175 K3 model made the last half of 1969 and first half of 1970. Might possibly fit the K0 but no guarantee. Brand New Filter pair , they show some shelf wear, but new and un-used. These filters do NOT have a mounting screw running through the center and will NOT fit anything beyond a CL175K3. Please make sure this is what you need.