For both the M38Cdn and the M38A1Cdn, try over at
http://www.willysmjeeps.com/v2/modul...=viewforum&f=3
You will likely have to subscribe to view or post. Wes has a pretty fair data base of vehicles, and can usually narrow down the CFRs to within a few.
As an aside, the CFRs were stamped on top of the left front frame rails of the jeeps. If you still have layers of paint, a paint scraper will usually reveal then pretty quick. As to the M100, the numbers were also stamped on the top of the left drawbar.
In the mid 80s, all our trailers went out for sandblasting, and the contractor mixed up all the plates. The scraper came in handy, but we revealed several CFRs which did not match what Ottawa said we had. So sometime over the years, the records in Ottawa got mixed.
One of the first trailers I ever bought had 2 CFRs. As I stripped the layers of paint down I came across a different number than that which was on the upper layers. The earliest number actually matched the serial number of the trailer. (ie serial 0018 and CFR 70018) As production went on, the serials did not directly match. So again, someone's record keeping was not up to snuff.