YZ125C/X and probably TY175 are the same.
The other likely candidates (DT, earlier/later YZes etc) are all different, in one way or another (usually relating to the shift drum and/or the rods the shift forks slide along, at least).
I've got a spare YZ-C case, but will have to confirm condition before making any big promises.
May also have a spare ignition cover too.