I have a 74 XR75 with late model CT110 forks, They are 27mm & approx 650mm from axle centre to flush with the top triple clamp in length, they went straight in & are longer than the stockers in the uppers but the bottoms are the same length so no more travel as such but they are good for balancing the ride height if you have jacked up the rear like I have, From about 95 on CT110's come with the better forks,the earlier ones had an external spring which rubbed on the chrome stuffing it in no time flat, The later have an internal spring
so much better, a quick way to tell the difference is the later jobs have no drain screws