CMS has two different gearbox for Yamaha 135LC usage. One is recently featured that is CMS Racing Hi-Way gearbox. The other one is CMS Racing Sprint Test(but on the box it is written Spring Track) gearbox.
No need to squint your eyes to find the differences since it only differs by one teeth on the fourth gear as circled in the above picture.
Quality is high as always from CMS. Recommended.
More pictures after the jump.