Jean,
Further to what Pete wrote, the "X2" means for export to the UK, as per the table in Wheels & Tracks issue No. 37 (October 1991): "CMP Assembly Overseas - Re-assembly of knocked-down Canadian Military Pattern vehicles".
Also, the lower plate in one of your photos is a rebuild plate. Often these have a post-war date, but your C30 seems to have been rebuilt on 20-Jan-45 if I read it correctly. By that time it was four years old and apparently had seen enough service to warrant a rebuild.
If you post a better picture of this plate there may be someone on this forum who can identify the workshop where it was rebuilt.
Hope this helps,
Hanno